| 围封条件下荒漠草原4种典型植物群落枯落物枯落量及其蓄积动态 |
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| 引用本文： | 李学斌,陈林,张硕新,谢应忠.围封条件下荒漠草原4种典型植物群落枯落物枯落量及其蓄积动态[J].生态学报,2012,32(20):6575-6583. |
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| 作者姓名： | 李学斌 陈林 张硕新 谢应忠 |
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| 作者单位： | 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川 750021;宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川 750021;西北农林科技大学林学院,杨凌 712100;宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川 750021 |
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| 基金项目： | 973前期专项(2012CB723206);国家自然科学基金项目(31140017);宁夏自然科学基金项目(NZ1017);教育部西部访学计划项目(2009);宁夏大学自然科学基金基目(NDZR10-63) |
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| 摘 要： | 以荒漠草原4种典型植物群落为研究对象,通过枯落物枯落量、组分及其影响因子的研究,探讨围封条件下荒漠草原枯落物枯落量及其蓄积动态。结果表明:围封内4种植物群落枯落物枯落量为:蒙古冰草群落(116.8g/m2)>甘草群落(101.6g/m2)>赖草群落(97.8g/m2)>沙蒿群落(88.1g/m2),分别是围封外的5.0、4.8、5.3和1.6倍;枯落物枯落动态具有一定的节律性,枯落物从6月开始出现,10月达到最大值,枯落量与降雨量、气温均呈对数负相关;枯落物的组分为:叶(59.25%)>枝(30.75%)>杂物(10.00%),其中立枯体占枯落物总量的60%以上;通过Birk模型对蓄积动态拟合以及与实测值比较分析,荒漠草原枯落物蓄积量随着蓄积年限的增加而增加,围封7—10a时,枯落物的蓄积量基本达到稳定状态,即输入量与输出量达到平衡。
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| 关 键 词： | 封育 荒漠草原 蓄积量 枯落动态 |
| 收稿时间： | 2012/3/13 0:00:00 |
| 修稿时间： | 2012/7/30 0:00:00 |
Litter amount and its dynamic change of four typical plant community under the fenced condition in desert steppe |
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| LI Xuebin,CHEN Lin,ZHANG Shuoxin and XIE Yingzhong.Litter amount and its dynamic change of four typical plant community under the fenced condition in desert steppe[J].Acta Ecologica Sinica,2012,32(20):6575-6583. |
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| Authors: | LI Xuebin CHEN Lin ZHANG Shuoxin and XIE Yingzhong |
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| Institution: | Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-western China, Yinchuan 750021, China;Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-western China, Yinchuan 750021, China;College of Forestry, Northwest Agriculture and Forestry University, Yangling 712100, China;Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-western China, Yinchuan 750021, China |
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| Abstract: | Litter amount and its dynamic change of four typical plant community under the fenced condition in desert steppe were studied. The result showed that the litter amount of four typical plant community under the fenced condition were in the sequence of Agropyron mongolicum Keng(116.8g/m2)> Glyeyrrhiza uralensis(101.6g/m2)> Leymussecalinus(97.8g/m2)> Artemisia desertorum(88.1g/m2), and there were 5.0, 4.8, 5.3 and 1.6 times than that under grazing condition, respectively. Change pattern of four typical plant community litter showed an increasing trend during growth season (from June to October), and there were negative relationship among litter amount and rainfall, temperature. The amount of different organs were in the sequence of leaf(59.25%)>branch(30.75%) >miscellany(10.00%), and standing dead litter account for 60% of litter amount. Comparative analysis between simulated and observed values of litter amount and litter dynamic fit by Birk model, the litter amount increased with increase years in desert steppe, and litter amount comes to a steady state after fenced for 7-10 years. The exchange between input and output reached balance. |
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| Keywords: | grazing enclosure desert steppe stock volume dead variation |
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