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1.
周自翔  李晶  冯雪铭 《生态学报》2013,33(9):2907-2918
气体调节服务功能是生态服务功能的重要的一部分,生态系统的固碳释氧功能,对于人类社会和整个动物界以及全球气候平衡,都具有重要意义.采用光合作用方程式,利用遥感估算模型,基于植被NPP(第一性生产力)物质量测算结果,测算关中-天水天经济区绿色植物固碳释氧物质量,以此为基础,分别采用造林成本法和工业制氧法测算其价值量,探讨关天经济区生态系统固碳释氧价值的时间变化、空间分布.结果表明:1)1998-2007年关天水经济区年固定CO2的价值量为226.35亿元/a.10a间2005年固定CO2的价值量最高,为301.73亿元/a,2002年最低,为159.06元/a.释放O2价值量取两种测评方法的平均值,年平均价值量为240.45亿元/a,比固定CO2的年均值多14.1亿元/a.2)从各土地利用类型来看,1998年和2007年平均固碳释氧价值排序为:林地>草地>耕地>其他类型.耕地向林地、草地转变时,平均固碳释氧价值分别增加了1614.29、1960.67元·hm-2·a-1,林地、草地向耕地转变时平均固碳释氧价值分别减少了1081.37、1706.60元·hm-2·a-1.3)从空间分布上来看,南部各县的单位面积固定CO2和释放O2价值普遍高于北部各县,总体上分布沿南部向北部逐渐降低.  相似文献   

2.
冯源  田宇  朱建华  肖文发  李奇 《生态学报》2020,40(14):5044-5054
固碳释氧是森林最重要的生态系统服务之一,将森林碳收支与固碳释氧服务价值评估相结合对于准确评估生态系统服务价值具有重要意义。应用森林碳收支模型(CBM-CFS3),分别基于净初级生产力(NPP)和净生态系统生产力(NEP)评估了2009—2030年湖北省兴山县森林生态系统总、净固碳释氧服务价值的时空动态,量化了异养呼吸造成的固碳释氧服务价值损失。模拟期间兴山县森林生态系统NPP逐渐增加(0.46—0.70 Tg/a),NEP由0.12 Tg/a先增加至0.21 Tg/a,然后逐渐下降至0.18 Tg/a;所对应的森林总、净固碳释氧服务价值范围分别为7.59—11.53亿元/a和2.21—3.70亿元/a。异养呼吸逐年增加,导致固碳释氧价值每年损失平均值为7.29亿元/a或4509元hm~(-2) a~(-1),约占总价值的68.6%。兴山县东南部异养呼吸造成的森林固碳释氧服务价值损失较高,而中部及西南部森林净固碳释氧价值较高。模拟期间兴山县森林为碳汇,稳定地提供固碳释氧服务。与NPP相比,使用NEP评估固碳释氧服务价值更为合理。忽视异养呼吸将严重高估森林生态系统固碳释氧服务价值;因而必须将物质循环过程与生态系统服务评估相结合,以降低评估结果的不确定性、提高生态系统服务的评估能力。  相似文献   

3.
李晶  任志远 《生态学杂志》2005,24(9):1029-1032
土地是一切陆地生态系统的载体,人类的一切活动同样离不开土地,在人类改造和利用自然的过程中不可避免地要影响各类生态系统的状况进而影响到它们为人类所提供的服务与功能。而第一性生产服务功能是生态系统服务功能主要特征之一。本文在地理信息系统的支持下,利用陕北黄土高原3期土地利用数据,估算了土地利用变化引起的生态系统服务价值的变化,结果表明,1996年区域NPP生态系统服务功能价值比1986年增加了1·17×108元;2001年生态服务功能价值比1986年增加了3·37×108元。因此,实施退耕还林、还草、遏制景观破碎化过程,合理控制城镇建设用地的扩展,是提高区域生态系统服务功能的有效途径。  相似文献   

4.
陕西省退耕还林固碳释氧价值分析   总被引:3,自引:0,他引:3  
利用基于EOS/MODIS的遥感生物地球化学模式(BIOME-BGC)NPP产品(MOD17A3),分析了2000—2010年陕西省退耕还林生态建设工程区植被固碳量时空变化,在此基础上根据林业行业标准《森林生态系统服务功能评估规范》(LY/T1721—2008),估算了退耕还林植被固碳释氧服务价值。结果表明:(1)2000—2010年陕西省退耕还林区平均植被固碳密度为299g·m-2·a-1。与2000年相比,2010年陕省退耕还林区固碳量增加了5.37×106t·a-1,合固碳价值14.01亿元·a-1,占全省固碳价值增量的50.4%,而退耕还林区面积仅占全省总面积38.5%。退耕还林区释氧量增加了1.43×107t·a-1,合释氧价值50.53亿元·a-1。(2)研究期间,陕西省退耕还林区固碳密度在波动中逐年缓慢增加,退耕还林区植被固碳密度变化增加趋势比其周边区域显著,固碳密度增加量比其周边高。陕北退耕还林区固碳密度增加的面积占其总面积的99.8%,固碳密度减少的面积仅占0.2%。退耕还林区低固碳密度所占的面积比例逐年减少,中、高固碳密度所占的面积比例逐年增加。(3)退耕还林区主要土地利用类型固碳密度均呈较明显的增长;不同坡度耕地固碳密度均具有不同程度的上升,退耕还林区>25°坡耕地固碳密度极显著(P<0.01)增加。说明随着退耕还林工程的实施,植被覆盖逐步得到改善,同时获得了显著的植被固碳释氧效益。  相似文献   

5.
温宥越  孙强  燕玉超  肖敏志  宋巍巍  杨剑 《生态学报》2020,40(23):8482-8493
基于CASA模型、碳税法和工业制氧法,测算了粤港澳大湾区2015年固碳释氧量及其价值,并结合ESA CCI-LC产品探讨了2000-2015年研究区陆地生态系统演变及其导致的固碳释氧量和价值的变化。结果表明:(1)2000-2015年,研究区城市扩张明显,主要表现为城镇用地侵占农田和草地。(2)研究区陆地生态系统91.03%固碳释氧量及其价值集中在森林和农田生态系统,2000-2015年陆地生态系统演变造成区域内固碳量和释氧量分别减少了53.49 G g和518.65 G g,对应固碳释氧价值损失量分别为1.79亿元和2.06亿元,合计3.85亿元,91.57%损失量是由城市扩张导致的。(3)城市覆盖面积与固碳释氧价值呈现强负相关,其扩张会促使生态系统固碳释氧价值逐渐减少,林地覆盖面积与固碳释氧价值呈现强正相关,其比重增加将有利于生态系统固碳释氧价值的培育。本文利用"邻域代理法"获得了研究区多类陆地生态系统演变情况及其对固碳释氧服务的影响,具有一定的推广价值。在未来发展过程中,粤港澳大湾区应该优化陆地生态系统类型,合理控制城市扩张,保护森林和农田资源,减少人类活动作用,增强生态系统自然演变过程。  相似文献   

6.
自2010年辽河保护区设立以来,保护区植被覆盖率从13.7%上升到63%,草地生态系统为保护区提供着重要的服务功能。为了提高人们对辽河保护区草地生态系统服务功能间接价值的认识,采用影子工程法、市场价值法、机会成本法等对辽河保护区草地生态系统的涵养水源、净化空气、固碳释氧、营养物质循环与储存和土壤保持等服务功能的间接价值进行了连续三年的评估。结果表明,随着时间的推移,辽河生态治理带来了巨大效益,2009年至2011年辽河保护区草地生态系统服务功能间接价值总量分别为:2.22亿元、1.82亿元和6.3亿元;从不同的服务功能类型来看,其价值量大小依次为:固碳释氧营养物质循环与储存涵养水源土壤保持空气净化,且固碳释氧的价值远远超过了其它功能的价值量。  相似文献   

7.
森林生态系统具有多种服务功能,对生态安全、生物资源和生存环境的保护、实现社会经济可持续发展起着重要的作用。依据国家林业局发布的《森林生态系统服务功能评估规范》(LY/T1721—2008),对涵养水源功能、保育土壤功能、固碳释氧功能、积累营养物质功能、净化大气功能5个方面进行评价,量化揭示天然林资源保护工程实施对长白山林区森林生态系统服务功能物质量及其价值的影响。结果表明:从1998年开始试点,到2010年一期正式结束,森林生态系统各项服务功能的物质量和价值量均呈现增加趋势。在涵养水源功能方面,调节水量增加了657.28×104m3,累计增加价值为113.45亿元;在保育土壤功能方面,固土量增加了4.6×104t,土壤中减少的氮流失0.02×104t,减少的磷流失0.01×104t,减少钾流失0.01×104t,累计增加价值为2.92亿元;在固碳释氧功能方面,固碳量增加了0.64×104t,释氧量增加了0.36×104t,累计增加价值为0.11亿元;在积累营养物质功能方面,固氮量、固磷量、固钾量均增加0.01×104t,累计增加价值0.3亿元;在净化大气功能方面,吸收二氧化硫、氟化物、氮氧化物、滞尘量分别增加24.71×104kg、0.64×104kg、1.08×104kg、1962.76×104kg,累计增加价值5.09亿元。森林生态系统服务功能价值总量增加了121.87亿元,平均每年增加约10亿元,超过工程每年各项投资之和。价值量增加额度依次为:1)涵养水源功能;2)固碳释氧功能;3)保育土壤功能;4)净化大气功能;5)积累营养物质功能。这些增加量只有一部分为工程区当地利用,其余都贡献到全国乃至全球。因此,及时制定和启动生态补偿等一系列政策和措施,将对更好的实施天然林资源保护工程、实现林区的可持续发展具有重要作用。  相似文献   

8.
1999—2003年陕西省森林生态系统固碳释氧服务功能价值评估   总被引:13,自引:0,他引:13  
基于陕西省森林生态系统的长期、连续定位观测,采用陕西省第6次森林资源清查数据,根据陕西省南北部气候差异显著的情况,采用森林在陕西南、北不同气候带下的实际生产力计算了森林生态系统固碳释氧的实物量。并采用市场价值法、费用代替法、替代工程法、Volume-derived biomass等方法估算森林生态系统固碳释氧服务功能的经济价值。结果表明:19992003年间,(1)陕西省北部森林生态系统年固碳量524.6×104t,年释氧量1404.6×104t,单位面积年固碳量1.364t/(hm.2a),单位面积年释氧量3.652t/(hm.2a)。(2)南部森林生态系统年固碳量1797×104t,年释氧量5918.9×104t,单位面积年固碳量3.459t/(hm.2a);南部单位面积年释氧量9.260t/(hm.2a)。陕西省南部森林生态功能明显优于北部森林。(3)从森林类型来看,林分单位面积生态功能最强,经济价值最大,疏林地的功能和价值则最小。(4)陕西省森林生态系统年固碳经济价值是328.27×108元,年释氧经济价值为732.35×108元,总价值1060.62×108元。(5)文中对陕西省优势树种固碳释氧功能的计算由于未能按照不同林龄分别计算,存在一定误差,需要进行更为深入、细致的研究。  相似文献   

9.
江西省阔叶林生态系统服务功能价值动态分析   总被引:5,自引:1,他引:4  
依据林业行业标准《森林生态系统服务功能评估规范》(LY/T1721—2008),利用江西省第五、第六次森林资源清查资料、森林生态站长期观测数据、公开发表文献数据及社会公共数据,对江西省"九五"和"十五"期间阔叶林生态系统服务功能价值进行了动态分析。结果表明:江西省阔叶林在"九五"期间生态系统服务功能年均总价值为1880亿元,单位面积价值为11.1万元·hm-2·a-1;"十五"期间生态系统服务功能年均总价值为2010亿元,单位面积价值为11.0万元·hm-2·a-1;年均总价值增长了6.91%,但单位面积价值减少了0.95%;其中,生物多样性保护和固碳释氧价值及其在总价值中所占比重增加最快;江西省阔叶林净生产力增长缓慢,致使2个时期6项服务功能价值大小排列顺序略有差异,但涵养水源、生物多样性保护和固碳释氧价值等前3项功能约占年均总价值的95%;在确保森林质量的同时,通过阔叶林保护和恢复、低效残次林改造及退耕还林工程等方式增加阔叶林面积,是提高阔叶林生态系统服务功能总价值的有效方式。  相似文献   

10.
为了对甘肃祁连山国家自然保护区生态系统效益进行定量评估, 分别运用替代工程法、历史比较法、碳税法、市场经济法对研究区内水源涵养、固土保肥、固碳释氧、净化大气等生态服务价值和森林直接经济价值进行了计算。结果表明, 甘肃祁连山国家自然保护区内不同植被生态服务价值具有明显的差异, 其中草地最高, 达426.80亿元, 疏林地最低, 为6.31亿元, 但乔木林单位面积生态服务功能价值最高; 固土保肥和固碳释氧是甘肃祁连山国家自然保护区生态系统的主要功能, 它们的生态服务价值占总价值的95.13%, 净化大气贡献比例较低, 占总价值的0.31%; 总体来看, 生态服务价值(789.28亿元)明显高于直接经济价值, 二者之比约为16:1。研究成果将会为区域自然资源和生态经济的可持续发展提供一定的技术保障。  相似文献   

11.
脱氮除硫菌株的分离鉴定和功能确认   总被引:2,自引:0,他引:2       下载免费PDF全文
从长期稳定运行的脱氮除硫反应器污泥中,分离获得两株具有脱氮除硫功能的芽孢杆菌。经形态观察、生理试验和16SrDNA序列比对,将两菌株归入芽孢杆菌属,菌株CB归类于Bacillus pseudofirmus,菌株CS则与Bacillus hemicellulosilytus和Bacillus halodurans最为接近。以Biolog板检测,菌株CB的基质多样性不明显,菌株CS则可利用Biolog板中多种碳源。菌株CB和菌株CS都能以硝酸盐氧化硫化物,其中菌株CB对硝酸盐、硫化物的转化能力大于CS,菌株CB对硝酸盐的亲和力也大于菌株CS。  相似文献   

12.
激光生物学是光子学和生物学相结合的交叉边缘学科,根据《光及有关电磁辐射的量和单位》国际标准(ISO/DIS31-6,1990)和我国国家标准(GB3102.6,1993),本文讨论了在激光生物学中常用的光学量、光子量和单位。  相似文献   

13.
We studied the effects of acute and chronic administration of secretin and caerulein, alone and in combination, on RNA and protein synthesis in the duodenum and oxyntic gland area as well as content of DNA, RNA and protein in rats. Secretin, 100 micrograms . kg-1, three times a day for 5 days, was associated with duodenal hypertrophy after the first 24 h of treatment and hyperplasia at the end of days 2 and 4; hypertrophy of the oxyntic gland area was observed only at 4 h after the first injection. Caerulein, 1 microgram . kg-1, also promoted duodenal hyperplasia after 2 and 4 days of treatment. The oxyntic gland area showed hypertrophy only at 4 h after the second injection of caerulein. These data indicate that both hormones can induce duodenal hyperplasia, probably by an amplification of the normal renewal cycle of the epithelial cells. They also demonstrated that growth of the oxyntic gland area is not promoted by these two peptides at the doses studied.  相似文献   

14.
以重庆市近郊中梁山槽谷为研究区,利用气象站和沉降仪获取2017年5月-2018年4月的大气无机氮、硫沉降数据和降水δ15N-NO3-、δ18O-NO3-和δ34S-SO42-、δ18O-SO42-数据,通过离子浓度比值、同位素值和气团后向轨迹探讨了研究区大气中氮、硫沉降变化特征及其来源。结果表明:(1)大气DIN总沉降量为19.99 kg/hm2,干、湿沉降量分别占11%和89%;大气S总沉降量为32.62 kg/hm2,干、湿沉降量分别占13%和87%。大气氮、硫湿沉降量与降水量均呈正相关(n=12,P < 0.01),氮、硫干湿沉降量具有明显的季节差异。(2)降水NH4+-N/NO3--N比值介于0.45-2.2之间,雨季(5-10月)NH4+-N/NO3--N>1,旱季(11-次年4月)NH4+-N/NO3--N<1,表明雨季氮主要来源于农业源,旱季来源于工业和交通源;降水NO3-/SO42-比值介于0.1-1.25之间,平均值为0.63,表明硫来源以固定污染源(燃煤)为主。(3)大气降水δ15N-NO3-、δ18O-NO3-值分别为-3.8‰-3.9‰(平均值为0.4‰±2.6‰)和58.7‰-98.7‰(平均值为76.1‰±14.3‰),夏季偏负,冬季偏正;降水δ34S-SO42-和δ18O-SO42-变化范围分别为1.3‰-3.2‰(平均值为2.3‰±1‰)和5.3‰-8.5‰(平均值为7.1‰±1.6‰),大气降水中NO3-和SO42-主要来源于当地的化石燃料燃烧,同时受到周边污染物的远距离传输影响。(4)气团后向轨迹表明影响研究区氮、硫干湿沉降来源的主要因素是东亚季风,北东-南西走向的川东平行岭谷大地貌格局加剧了季风的影响。  相似文献   

15.
16.
桃果实细胞内糖酸分布对果实甜酸风味的影响   总被引:3,自引:0,他引:3       下载免费PDF全文
以成熟‘白凤’桃果实为实验材料,采用区室化分析方法计算细胞内液泡、细胞质和细胞间隙中各糖酸组分的含量,并用调查问卷的方式对成熟桃果实甜酸风味进行评价打分,研究果肉细胞内各糖酸组分含量及其分布对果实甜酸风味的影响。结果表明:(1)成熟桃果实中可溶性糖(蔗糖、葡萄糖、果糖和山梨醇)在液泡、细胞质和细胞间隙的含量分别为27.3、11.6和9.0mg·g-1,有机酸(苹果酸、柠檬酸、奎宁酸和莽草酸)含量分别为2.09、0.94和0.35mg·g-1;蔗糖和苹果酸含量分别占果实可溶性糖和有机酸含量的80.6%和77.0%,是成熟桃果实中糖和酸的主要储存形式。(2)果实细胞内各糖酸组分通过细胞膜的渗透速率明显高于液泡膜。(3)块状处理桃果实液泡、细胞质与细胞间隙中的糖含量比、酸含量比及糖酸比分别为3.0∶1.3∶1.0、6.0∶2.7∶1.0、13.9∶12.4∶23.1,而匀浆处理果实的细胞结构被破坏,其不同细胞器中的比例分别为1.0∶1.0∶1.0、1.0∶1.0∶1.0、14.0∶14.0∶14.0;块状果实风味评价得分(2.99)明显高于匀浆处理果实(1.98)。研究认为,桃果实细胞中液泡、细胞质和细胞间隙之间糖酸含量以及糖酸比的差异可能是导致果实甜度风味变化的重要原因。  相似文献   

17.
Darkness mediates different senescence-related responses depending on the targeting of dark treatment (whole plants or individual leaves) and the organs that perceive the signal (leaves or cotyledons). In this study, we presented data on the differential effects of 2-day dark treatment on progression of senescence in cotyledons and primary leaves of 14-day-old plants of Cucurbita pepo L. (zucchini). The lack of changes in chlorophyll a, chlorophyll b and carotenoid contents as well as in the PSI activity measured by the far-red induced alterations in the P700 oxidation levels and the quantum yield of electron transport from Q A to PSI end acceptors () indicated higher resistance of cotyledons to the applied dark stress compared to the primary leaves. In contrast to cotyledons, PSI activity in the primary leaves was significantly inhibited. Concerning the activity of PSII analyzed by the changes in the JIP-test parameters (the maximal efficiency of PSII photochemistry, ; the performance index, PIABS; the efficiency of Q A reoxidation, ψ 0 and the effective dissipation per reaction center, DI0/RC), no differences were observed between cotyledons and primary leaves, thus suggesting that PSI activity in the true leaves was more susceptible to the applied dark stress. The transfer of the darkened plants to normal light regime resulted in delayed senescence in cotyledons which was in contrast to results on Arabidopsis, thus implying the existence of specific mechanisms of cotyledon senescence in different monocarpic plants.  相似文献   

18.
Inastrocytes, as [K+]o was increased from 1.2 to 10 mM, [K+]i and [Cl]i were increased, whereas [Na+]i was decreased. As [K+]o was increased from 10 to 60 mM, intracellular concentration of these three ions showed no significant change. When [K+]o was increased from 60 to 122 mM, an increase in [K+]i and [Cl]i and a decrease in [Na+]i were observed.Inneurons, as [K+]o was increased from 1.2 to 2.8 mM, [Na+]i and [Cl]i were decreased, whereas [K+]i was increased. As [K+]o was increased from 2.8 to 30 mM, [K+]i, [Na+]i and [Cl]i showed no significant change. When [K+]o was increased from 30 to 122 mM, [K+]i and [Cl]i were increased, whereas [Na+]i was decreased. Inastrocytes, pHi increased when [K+]o was increased. Inneurons, there was a biphasic change in pHi. In lower [K+]o (1.2–2.8 mM) pHi decreased as [K+]o increased, whereas in higher [K+]o (2.8–122 mM) pHi was directly related to [K+]o. In bothastrocytes andneurons, changes in [K+]o did not affect the extracellular water content, whereas the intracellular water content increased as the [K+]o increased. Transmembrane potential (Em) as measured with Tl-204 was inversely related to [K+]o between 1.2 and 90 mM, a ten-fold increase in [K+]o depolarized the astrocytes by about 56 mV and the neurons about 52 mV. The Em values measured with Tl-204 were close to the potassium equilibrium potential (Ek) except those in neurons at lower [K+]o. However, they were not equal to the chloride equilibrium potential (ECl) at [K+]o lower than 30 mM in both astrocytes and neurons. Results of this study demonstrate that alteration of [K+]o produced different changes in [K+]i, [Na+]i, [Cl]i, and pHi in astrocytes and neurons. The data show that astrocytes can adapt to alterations in [K+]o, in such a way to maintain a more suitable environment for neurons.  相似文献   

19.
In the chromoplast fraction and in the chromoplast-free fraction, obtained from Calendula officinalis ligulate flowers, the contents of individual free and ester-bound triterpene alcohols and sterols as well as the fatty acid components of the ester form were determined. It was shown that all sterols and triterpene monols in both forms occur in the two subtractions investigated, whereas all diols are localized only in the chromoplast fraction. The compositions of the fatty acids esterifying monols and sterols were similar to those esterifying diols in the chromoplasts. However, the fatty acids esterifying extra-chromoplast monols and sterols were different. This result indicates that triterpene monol esters are substrates for the biosynthesis of 3-monoesters of diols.  相似文献   

20.
AimsLeymus chinensis is a constructive and dominant species in typical steppe of northern China. The structure and functions of L. chinensis grassland ecosystem has been degenerated seriously due to long-term overgrazing in recent decades. As an effective measure to restore the degraded grasslands, the effects of nutrient addition on plant growth and ecosystem structure and functioning have been paid more attention in manipulation experimental research. The effects of nutrient addition, especially P addition on the above- and below-ground functional traits of L. chinensis have rarely been studied; particularly the underpinning mechanisms remain unclear. Our objective is to examine the responses and adaptive mechanisms of L. chinensis to different levels of N and P additions. MethodsWe conducted a culture experiment in the greenhouse, with three levels of N (50, 100 and 250 mg N·kg-1) and P (5, 10 and 25 mg P·kg-1) addition treatments. The above- and below-ground biomass, leaf traits (e.g., specific leaf area, leaf N and P contents) and root traits (e.g., specific root length, root N and P contents) of L. chinensis were determined in this study.Important findings Our results showed that: 1) the aboveground biomass and total biomass of L. chinensis were mostly affected by N addition, while the belowground biomass was mainly affected by P addition. N addition greatly enhanced the aboveground biomass of L. chinensis, while P addition reduced the belowground biomass at the moderate and high N levels. The root-shoot ratio of L. chinensis was influenced by both N and P additions, and root-shoot ratio decreased with increasing N and P levels. N and P additions promoted more biomass and N and P allocations to aboveground and leaf biomass. 2) Leymus chinensis showed different responses and adaptive mechanisms to P addition at low and high N levels. At low N level, L. chinensis exhibited high photosynthetic rate and specific root length (SRL) to improve photosynthetic capacity and root N acquisition, which promoted aboveground biomass. High root P content was favorable for belowground biomass. At high N level, P addition did not significantly affect plant growth of L. chinensis, even reduced its belowground biomass. Leymus chinensis showed high specific leaf area (SLA) and SRL to improve light interception and N acquisition in order to maintain stable aboveground biomass. 3) P addition greatly impacted below-ground than above-ground functional traits. SLA exhibited a weakly positive correlation with SRL, indicating L. chinensis exhibited relatively independence of resource acquirement and utilization between leaf and root functional traits.  相似文献   

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