高寒草甸对植物多样性短期丧失的响应  

Response of alpine meadow to the short-term loss of plant diversity

作　　者：田红[1] 李文金[2] 张玉珍[1] 

机构地区：[1]甘肃农业大学林学院,甘肃兰州730070 [2]兰州大学生命科学学院草地农业生态系统国家重点实验室,甘肃兰州730000

出　　处：《甘肃农业大学学报》2015年第1期93-98,共6页Journal of Gansu Agricultural University

基　　金：国家自然科学基金(31100306;31470480);兰州大学中央高校基本科研业务费专项资金(lzujbky-2014-202)

摘　　要：采用人工剔除高寒草甸不同植物功能群模拟植物多样性丧失,添加氮肥模拟氮沉降,研究不同植物功能群丧失和氮沉降对高寒草甸植物和土壤群落结构和功能的影响.结果表明:随着植物多样性的丧失,植物生物量、物种丰富度及植被盖度都显著降低(P<0.05),土壤线虫数量也随之大幅减少,细菌多样性有明显差别.其中土壤线虫数量与植物生物量呈显著正相关(P<0.05),与土壤硝态氮和土壤有机碳呈显著负相关(P<0.05).土壤氨态氮与植物生物量、物种丰富度及植被盖度呈显著正相关(P<0.05).Using artificial removal of different plant functional group in alpine meadow simulated loss of plant diversity and adding nitrogen simulated future nitrogen deposition,the aim was to study the impact of different plant functional group loss on plants and soil community structure and function in the alpine meadow.The results showed that,with the loss of plant diversity,plant biomass,species richness,vegetation coverage and soil nematode density decreased significantly （P〈0.05）.There were obvious differences between the bacterial diversity among the removal treatments.There was significant positive correlation between soil nematodes density and plant biomass （P〈0.05）.In contrast,soil nitrate nitrogen and soil organic carbon had significant negative correlation with soil nematode population （P〈0.05）.Plant biomass, species richness and vegetation coverage had significant positive correlation with soil ammonium nitrogen （P〈0.05）.

关 键 词：高寒草甸 去除实验 土壤线虫 植物多样性 

分 类 号：Q145[生物学—生态学]