摘要
探明金沙江干热河谷土壤C、N、P化学计量和土壤酶活性特征,是该区域生态恢复的重要决策依据.2021年1月通过野外调查、土样采集及室内分析,对金沙江干热河谷上、中、下游共32个样地表层土壤的C、N、P化学计量和酶活性特征及其相互关系进行研究.结果表明:①金沙江干热河谷土壤C、N、P元素含量受气候、土壤和植被等环境因子影响,其含量均表现为上游>下游>中游的特征,而土壤C/N值(含量比)从上游向下游逐渐降低,土壤C/P值(含量比)和N/P值(含量比)均呈从上游向下游逐渐增加的趋势.②土壤脲酶(Ure)、β-葡萄糖苷酶(BG)和酸性磷酸酶(AP)的酶活性受金沙江干热河谷上、中、下游气候以及土壤、植被等环境因子的影响,其活性均表现为上游>下游>中游的特征.③金沙江干热河谷不同植被类型土壤C、N、P含量和酶活性均表现为天然林>人工林>稀树灌草丛的特征.研究显示:金沙江干热河谷上、中、下游土壤C、N、P元素含量及其化学计量比和土壤酶活性存在空间差异,可能与不同区段的气候、土壤、植被等因素有关;适宜的气候、土壤和植被能增加土壤C、N、P元素含量,提高土壤Ure、BG和AP酶活性.
Identifying soil C,N,P stoichiometry and enzyme activity in the Dry-Hot Valley of Jinsha River is the decision-making basis for regional ecological restoration.The relationships between soil C,N,P stoichiometry and enzyme activities were studied from 32 soil samples in the upper,middle and lower reaches of the Dry-Hot Valley of Jinsha River.The results showed that:(1)The contents of soil C,N and P were affected by climate,soil and vegetation,and the highest contents of soil C,N and P were in the upper reaches and the lowest were in the middle reaches,and soil C/N ratios were decreased down the Jinsha River,and C/P and N/P ratios were increased down the Jinsha River.(2)The activities of soil urease(Ure),β-glucosidase(BG)and acid phosphatase(AP)were affected by climate,soil,vegetation and other environmental factor,and the activities were showed as upper reaches>lower reaches>middle reaches.(3)Soil C,N,P contents and enzyme activities from plots of different vegetation types were as follows:natural forest>plantation forest>savannah.The results showed that the spatial differences of soil C,N,P contents and soil enzyme activities at various reaches of the Dry-Hot Valley of Jinsha River may be related to climate,soil,vegetation and other factors in the region.Suitable climate,soil and vegetation can increase soil C,N and P contents,and improve the soil enzyme activities.
作者
阮长明
杜寿康
孙永玉
张春华
欧朝蓉
王猛
唐国勇
RUAN Changming;DU Shoukang;SUN Yongyu;ZHANG Chunhua;OU Chaorong;WANG Meng;TANG Guoyong(College of Forestry,Southwest Forestry University,Kunming 650224,China;Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650233,China;Yuanmou Desert Ecosystem Research Station,Kunming 650233,China)
出处
《环境科学研究》
CAS
CSCD
北大核心
2022年第11期2486-2494,共9页
Research of Environmental Sciences
基金
国家重点研发计划项目(No.2017YFC0505102)
云南省自然生态监测网络监测项目(No.2022-YN-07)。
关键词
干热河谷
区段
元素化学计量
酶活性
Dry-Hot Valley
reach
element stoichiometry
enzyme activity
