中国陆地生态系统叶凋落物分解的格局及控制因素  

Pattern and Controlling Factors of Terrestrial Leaf Litters Decomposition in China

作　　者：谢亚军 梁越 肖红伟 朱仁果 罗笠 郭威 曹彦圣 张忠义 潘媛媛 郑能建 潘春蓉 熊辉[3] XIE Ya-jun;LIANG Yue;XIAO Hong-wei;ZHU Ren-guo;LUO Li;GUO Wei;CAO Yan-sheng;ZHANG Zhong-yi;PAN Yuan-yuan;ZHENG Neng-jian;PAN Chun-rong;XIONG Hui(Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution,East China University of Technology,Nanchang,JX 330013,China;Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha,HN 410125,China;Hunan Research Academy of Environmental Sciences,Changsha,HN 410004,China)

机构地区：[1]东华理工大学江西省大气污染成因与控制重点实验室,江西南昌330013 [2]中国科学院亚热带农业生态研究所洞庭湖湿地生态系统观测研究站,湖南长沙410125 [3]湖南省环境保护科学研究院,湖南长沙410004

出　　处：《东华理工大学学报（自然科学版）》2018年第3期271-276,共6页Journal of East China University of Technology(Natural Science)

基　　金：江西省科技厅自然基金项目(20171BAB214010);东华理工大学校科技创新团队科研启动基金项目(DHKT2015101);东华理工大学博士科研启动基金项目(DHBK2016108)

摘　　要：分析我国大空间尺度下气候对叶凋落物分解的调控机制,可以为预测中国生物地球循环对未来气候变化的响应提供理论基础和数据支持。针对我国大空间尺度下叶凋落物的分解建立数据库,中国叶凋落物平均分解速率为0. 726y-1,其中阔叶>草本>针叶。分解速率与年均温、年均降水、凋落物N、P和K含量正相关,而与凋落物C、纤维素和木质素含量负相关。本研究证明气候可以直接影响凋落物分解,但是并不支持气候通过凋落物性质而间接影响凋落物分解这一观点。年均降水和凋落物养分含量解释了全部叶凋落物分解速率85. 4%的变异,而年均降水和凋落物纤维素含量解释了阔叶凋落物分解速率84%的变异。这些结果表明,大空间尺度下,气候和凋落物性质直接影响着中国陆地叶凋落物分解,且气候比凋落物性质更重要。The mechanism of climate controlling the terrestrial leaf litter qualities and decomposition rates on large spatial scale in China was explored to provide the basis for an accurate prediction the long-term ecosystem C and N cycling in future climatic scenarios.A comprehensive database was established based on 825 samples from 127 sites of terrestrial leaf litter decomposition across China.The averaged decomposition rate was 0.726 y-1 for terrestrial leaf litters.The decomposition rate in plant types decreased in the order broadleaved>herb>coniferous.Generally,decomposition rate was positively correlated with MAT(mean annual temperature),MAP(mean annual precipitation)and nutrient contents,but negatively with contents of C,lignin,and cellulose.The climate directly influenced the leaf litter decomposition,rather than indirectly via litter quality.The multiple regressions indicated that,85.4%of the variability of decomposition rate for all plant types was explained by MAP together with nutrient contents,and 84%for broadleaved plant by MAP together with cellulose content.These data suggest that,on large spatial scale in China,terrestrial leaf litter decomposition was directly controlled by both climate and litter quality.Climate conditions play a more important role in the controls of terrestrial leaf litter decomposition by temperature and moisture,with litter qualities being a secondary factor.

关 键 词：叶凋落物 分解 凋落物性质 年均温 年均降水 针叶 阔叶 草本 

分 类 号：X173[环境科学与工程—环境科学]