文献类型：期刊文献

中文题名：金沙江干热河谷不同海拔土壤碳氮磷化学计量和酶活性研究

英文题名：Stoichiometry of soil carbon,nitrogen,phosphorus and enzyme activities at various elevations in the Dry?Hot Valley of the Jinsha River

作者：阮长明[1,2] 唐国勇[1,3] 杜寿康[1] 张春华[1,3] 欧朝蓉[2] 罗孔[1,2] 田瑞杰[4] 王猛[2] 孙永玉[1,3]

第一作者：阮长明

机构：[1]中国林业科学研究院高原林业研究所,昆明650233;[2]西南林业大学林学院,昆明650224;[3]云南元谋干热河谷生态系统国家定位观测研究站,昆明650233;[4]重庆大学环境与生态学院,重庆400045

年份：2023

卷号：36

期号：11

起止页码：2464-2472

中文期刊名：西南农业学报

外文期刊名：Southwest China Journal of Agricultural Sciences

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：国家林业和草原局林草科技创新平台运行项目(2022132108);云南省自然生态监测网络监测项目(2022?YN?07)。

语种：中文

中文关键词：干热河谷;海拔;土壤;化学计量;酶活性

外文关键词：The Dry?Hot Valley;Elevation;Soil;Stoichiometry;Enzyme activity

分类号：S158

摘要：【目的】金沙江干热河谷生态环境恶劣,植被生长发育差,探明该区域内土壤碳、氮、磷化学计量和酶活性特征,对金沙江干热河谷植被恢复及生态治理具有重要意义。【方法】选取金沙江干热河谷上、中、下游海拔800~2000 m内的土壤为研究对象,通过野外调查、土壤采集和室内分析,对该区域土壤的基本理化性质、碳氮磷元素含量及土壤酶活性进行测定。【结果】在金沙江干热河谷不同海拔气候、土壤、植被等环境因子影响下,上、中、下游的土壤有机碳、全氮、全磷含量均随海拔升高而显著增加(P<0.05);金沙江干热河谷环境因子恶劣,导致土壤C/N、C/P、N/P值均小于全国平均水平。在金沙江干热河谷不同海拔气候、土壤、植被等环境因子影响下,上、中、下游的土壤脲酶、β?葡萄糖苷酶和酸性磷酸酶的活性均随海拔升高而显著增加(P<0.05)。金沙江干热河谷不同海拔的土壤碳、氮、磷元素含量与土壤脲酶、β?葡萄糖苷酶和酸性磷酸酶的活性之间呈极显著正相关(P<0.01),两者相互联系能更客观地反映金沙江干热河谷土壤质量及变化特征。【结论】金沙江干热河谷上、中、下游800~2000 m海拔内土壤碳、氮、磷化学计量和土壤酶活性特征具有高度空间异质性,海拔越高,土壤碳、氮、磷元素含量和酶活性越高。
【Objective】The ecological environment in the Dry?Hot Valley of the Jinsha River is harsh,resulting in poor vegetation growth and development.Exploring the soil carbon,nitrogen,phosphorus stoichiometry and enzyme activities in this area is of great significance to the vegetation restoration and ecological management in the Dry?Hot Valley of the Jinsha River.【Method】The soil in the upper,middle and lower reaches in the Dry?Hot Valley of the Jinsha River,spanning elevations from 800 m to 2000 meters,were selected as the research sub?jects.Through field investigations,soil collection and laboratory analysis,the basic physical and chemical properties,carbon,nitrogen and phosphorus contents,as well as soil enzyme activities were tested in this region.【Result】Under the influence of various environmental factors including climate,soil and vegetation at different altitudes in the Dry?Hot Valley of the Jinsha River,the contents of soil organic carbon,total nitrogen,and total phosphorus in the upper,middle and lower reaches significantly increased with increasing altitude(P<0.05);The harsh environmental factors in the Dry?Hot Valley of the Jinsha River had resulted in soil C/N,C/P and N/P values being lower than the na?tional average.Under the influence of climate,soil,vegetation and other environmental factors at different altitudes in the Dry?Hot Valley of the Jinsha River,the enzyme activities of soil urease,β?glucosidase and acid phosphatase in the upper,middle and lower reaches of the Jin?sha River all increased significantly with increasing altitude(P<0.05).Moreover,the content of soil carbon,nitrogen and phosphorus at various altitudes was positively correlated with soil urease,β?glucosidase and acid phosphatase activities(P<0.01).The correlation among the elements provided more objective reflection of soil quality and changing characteristics in the Dry?Hot Valley of the Jinsha River.【Con?clusion】The stoichiometric characteristics of soil carbon,nitrogen and phosphorus,along with soil enzyme activity,exhibit high spatial het?erogeneity at altitudes ranging from 800 to 2000 meters in the upper,middle and lower reaches of the Dry?Hot Valley of the Jinsha River.As altitude increases,there is corresponding increase in the content of soil carbon,nitrogen and phosphorus as well as enzyme activity.