晋北刈割草地土壤有机氮矿化和真菌多样性特征  

Soil Organic Nitrogen Mineralization and Fungal Diversity Characteristics of Mowing Grassland in Northern Shanxi Province

作　　者：王犇 欧俊 任歆玥 郝杰[3] 米佳 王常慧[3,5] 董宽虎 WANG Ben;OU Jun;REN Xinyue;HAO Jie;MI Jia;WANG Changhui;DONG Kuanhu(Institute of Loess Plateau,Shanxi Key Laboratory for Ecological Restoration of Loess Plateau China,Shanxi University,Taiyuan 030006,China;Xinfeng Middle School of Jiangxi Province,Xinfeng 341699,China;College of Grassland Science,Shanxi Agricultural University,Taigu 030801,China;Field Scientific Observation and Research Station of the Ministry of Education for Subalpine Grassland Ecosystem in Shanxi,Ningwu 036700,China;Observation and Research Station for Grassland Ecosystem in the Loess Plateau,Youyu 037200,China)

机构地区：[1]山西大学黄土高原研究所,黄土高原生态恢复山西省重点实验室,山西太原030006 [2]江西省信丰中学,江西信丰341699 [3]山西农业大学草业学院,山西太谷030801 [4]山西亚高山草地生态系统教育部野外科学观测研究站,山西宁武036700 [5]山西右玉黄土高原草地生态系统定位观测研究站,山西右玉037200

出　　处：《山西大学学报（自然科学版）》2024年第5期1068-1078,共11页Journal of Shanxi University(Natural Science Edition)

基　　金：山西省基础研究计划资助项目(202203021211303,202203021221014);国家自然科学基金(31572452)。

摘　　要：为探究晋北地区刈割强度对草地土壤有机氮矿化与真菌多样性之间关系的影响,通过对刈割草地进行野外原位土壤氮矿化实验和土壤真菌多样性分析。结果表明:在8月份中度刈割强度下土壤净氮矿化量最高;在整个生长季,土壤净氮矿化量均值大小为中度刈割>重度刈割>轻度刈割>不刈割,生长季土壤净氮矿化量呈现出中度刈割处理最高并显著高于不刈割处理;草地的刈割处理增加了土壤真菌多样性,土壤真菌ACE(Abundance-based Coverage Estimator)指数、Chao指数和Shannon-Wiener指数均在中度刈割强度下达到最大值(分别为737.2、738.5和4.506),Simpson指数在重度刈割强度下达到最大值(0.072);被孢霉门(Mortierellomycota)和被孢霉属(Mortierella)会受到当月净硝态氮含量、净氮矿化含量的潜在抑制,附球菌属(Epicoccum)与当月净铵态氮含量存在负效应;土壤全碳与子囊菌门(Ascomycota)、赤霉菌属(Gibberella)和新赤壳属(Neocosmospora)的丰度存在正效应,土壤碳氮比可能会促进小盘菌属(Pezizella)的丰度。In order to investigate the effect of mowing intensity on the relationship between soil organic nitrogen mineralization and fungal diversity in grassland in northern Shanxi Province,soil nitrogen mineralization in situ field experiment and soil fungal community analysis were conducted on the mowed grassland.The results showed that soil net nitrogen mineralization was the highest under moderate mowing intensity in August.The mean values of soil net nitrogen mineralization during the whole growing season from high to low were in the following order:moderate mowing,heavy mowing,light mowing and no mowing.Soil net nitrogen mineralization of moderate mowing treatment was the highest and significantly higher than that in no mowing treatment in the growing season.The diversity of soil fungi community was increased by mowing treatment.The ACE index,Chao index and ShannonWiener index reached the maximum under moderate mowing intensity(737.2,738.5 and 4.506,respectively),and the Simpson index reached the maximum under heavy mowing intensity(0.072).Mortierellomycota and Mortierella were inhibited by the net nitrate nitrogen content and net nitrogen mineralization content of the month,while Epicoccum had a negative effect on the monthly net ammonium nitrogen content.Soil total carbon significantly promoted the abundance of Ascomycota,Gibberella and Neocosmospora,while soil C/N ratio promoted the abundance of Pezizella.

关 键 词：农牧交错带 刈割强度 有机氮矿化 土壤真菌群落 

分 类 号：S812.2[农业科学—草业科学]