不同植被配置下土壤碳矿化潜力

生态学杂志 ›› 2011, Vol. 30 ›› Issue (11): 2442-2448.

不同植被配置下土壤碳矿化潜力

周玉燕1,3,贾晓红1**,赵昕1,2,陈国雄1,2,高艳红1,3,吴攀1,3

1中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站，兰州 730000；2中国科学院寒区旱区环境与工程研究所植物生理与分子生物学实验室，兰州 730000；3中国科学院研究生院，北京 100049

出版日期:2011-11-08 发布日期:2011-11-08

Soil carbon mineralization potential under different configuration of vegetation.

ZHOU Yu-yan1,3, JIA Xiao-hong1**, ZHAO Xin1,2, CHEN Guo-xiong1,2, GAO Yan-hong1,3, WU Pan1,3

1Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environment and Engineering Institute, Chinese Academy of Sciences,Lanzhou 730000, China;2Plant Physiology and Molecular Biology Laboratory, Cold and Arid Regions Environment and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, China;3Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Online:2011-11-08 Published:2011-11-08

摘要/Abstract

摘要： 通过实验室培养的方法，研究了沙坡头地区不同植被配置区(纯柠条、纯油蒿、柠条油蒿混交林)土壤碳矿化潜力及不同凋落物在土壤中的分解。结果表明，通过103 d的室内培养，相同配置不同处理的土壤碳矿化差异不显著，灌丛密度高的植被配置碳矿化量高。不同生境土壤CO₂-C的释放在灌丛下不加凋落物处理的情况下，单行油蒿与双行柠条样地间碳矿化存在显著性差异(P=0.047)，其他各样地及各处理差异均不显著。总的来说，柠条样地土壤碳矿化潜力高于其他2种样地。凋落物分解速率在不同生境土壤最初的分解速率均为1年生草本混合样>油蒿>柠条，在培养40 d之后，3种凋落物的分解速率趋于一致，这与草本较高的C、N、C/N比有关。另外，柠条样地的土壤加油蒿凋落物比在柠条样地的土壤中加柠条凋落物有较高的初始碳矿化潜力，这除与油蒿凋落物较易分解有关外还与不同生境土壤养分的可利用性有关, 但在培养过程中出现拐点，这与柠条较高的C、N、C/N有关。在不同生境的土壤中，碳矿化潜力均为灌丛下>灌丛外，灌木的存在使更多的有机质和养分积聚在灌丛下，形成灌丛肥岛，对碳的固存具有显著贡献。

关键词: 人为侵蚀, 土石场, 空间分布, 景观生态影响度

Abstract: Soil samples were collected from the plots of different vegetation configuration (Caragana korshinskii, Artemisia ordosica, and C. korshinskii-A. ordosica) in Shapotou region of Ningxia Province, Northwest China, and an incubation was conducted to study the mineralization potential of soil carbon and the litter decomposition in soil. During 103 days incubation, no significant differences were observed in the soil carbon mineralization under the same vegetation configuration and with or without litter addition, but the mineralization rate of soil carbon was higher under the vegetation configuration with high density C. korshinskii.There was a significant difference (P=0.047) in the soil CO₂-C release from the single row of A.ordosica and from the double rows of C.korshinskii under C. korshinskii-A. ordosica and without litter addition, but no significant difference under the other vegetation configurations and with or without litter addition.Overall, the soil carbon mineralization potential under C. korshinskii was higher than that under Artemisia ordosica and C. korshinskii-A. ordosica. At early phase, the decomposition rate of the litters in soil was in the order of C. korshinskii-A. ordosica > A. ordosica > C. korshinskii. After 40 days incubation, the decomposition rate of the litters tended to be the same. The higher decomposition rate of annual plant litter could be attributed to its high C and N contents and its high C/N ratio. The soil amended with A. ordosica litter under C. korshinskii had a higher potential of carbon mineralization than the soil amended with C. korshinskii litter under A. ordosica, because of the differences in the litter chemical composition and the soil nutrient availability. However, a turning point appeared during incubation, due to the higher C and N contents and the higher C/N ratio of C. korshinskii litter. Under different vegetation configuration, the soil carbon mineralization potential was higher under the canopy than outside the canopy. The existence of shrub created a ‘fertile island’ with higher organic matter and nutrient contents and higher microbial activity under canopy, and contributed more to C sequestration.

Key words: Artificial erosion, Quarry, Spatial distribution, Landscape ecological impact degree

周玉燕,贾晓红,赵昕,陈国雄,高艳红,吴攀. 不同植被配置下土壤碳矿化潜力[J]. 生态学杂志, 2011, 30(11): 2442-2448.

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