祁连山东段退化高寒草地修复过程中土壤微生物生物量变化  

Changes of Soil Microbial Biomass During the Restoration of the Degraded Alpine Grasslands in Eastern Qilian Mountains

作　　者：李双雄 姚拓[1] 王理德[2,3,4] 韩江茹 宋达成 赵赫然 杨继杰 李雪梅 吉凌鹤 姬如欣 LI Shuang-xiong;YAO Tuo;WANG Li-de;HAN Jiang-ru;SONG Da-cheng;ZHAO He-ran;YANG Ji-jie;LI Xue-mei;JI Ling-he;JI Ru-xin(College of Prataclutural Science,Gansu Agricultural University,Key Laboratory of Grassland Ecosystem Ministry of Education,Lanzhou,Gansu Province 730070,China;Gansu Desert Control Research Institute,Lanzhou,Gansu Province 730070,China;Gansu Hexi Corridor Forest Ecosystem National Research Station,Wuwei,Gansu Province 733300,China;Minqin National Station for Desert Steppe Ecosystem Studies,Minqin,Gansu Province 733300,China)

机构地区：[1]甘肃农业大学草业学院,草业生态系统教育部重点实验室,甘肃兰州730070 [2]甘肃省治沙研究所,甘肃兰州730070 [3]甘肃河西走廊森林生态系统国家定位观测研究站,甘肃武威733000 [4]甘肃民勤荒漠草地生态系统国家野外科学观测研究站,甘肃民勤733300

出　　处：《草地学报》2023年第12期3668-3675,共8页Acta Agrestia Sinica

基　　金：国家自然科学基金:祁连山东段治理矸石重构土壤系统演变及其驱动机制(42167069);甘肃省青年科技基金:祁连山东段退化高寒草地修复过程中土壤微生物变化规律研究(21 JR7RA734)共同资助。

摘　　要：为探究退化高寒草地修复过程中土壤微生物生物量的变化规律和最佳修复年限,本研究以人工沙棘林(Hippophae rhamnoides Linn.)修复的祁连山东段哈溪双龙沟废弃矿区不同修复年限(2 a,5 a,10 a)及未修复治理(CK)的12个样地为研究对象,采用时空替代法,研究分析了土壤微生物生物量的季节变化特征及动态转变规律。结果表明:表层土壤微生物生物量整体高于深层土壤;土壤微生物量碳(Soil microbial biomass carbon,SMBC)含量随修复年限增加而显著增加,土壤微生物量氮(Soil microbial biomass nitrogen,SMBN)含量在极小范围内波动式变化,含量最高分别为194.38 mg·kg^(-1)和51.90 mg·kg^(-1),同0 a相比增加91.36%和90.70%,土壤微生物量磷(Soil microbial biomass phosphorus,SMBP)含量先急剧变化后趋于稳定;不同土层的SMBC含量随修复年限的增加其季节变化规律大致相似,秋季含量最高,冬季次之,春夏季较低,SMBN的季节性变化规律基本与之相似且整体处于相对稳定状态,SMBP处在漫长的累积过程中且冬季含量较高。本研究结果表明,修复5 a左右是该区域土地修复利用及综合治理的关键时期。In order to detect the changes of soil microbial biomass and identify the optimum restoration years of the degraded alpine grassland,to explore the restoration ability of artificial Hippophae rhamnoides forest to abandoned mining areas,the seasonal variation characteristics and dynamic transformation rules of soil microbial biomass in 12 restoration plots of 0(CK),2,5 and 10 years since abandonment in the abandoned mining area of Shuanglonggou in Eastern Qilian Mountains were investigated by using the space-for-time substitution method.The results showed that the overall microbial biomass in the surface soil was higher than that in the deep soil.The content of soil microbial biomass carbon(SMBC)increased significantly with the lengthening of restoration years and peaked at 194.38 mg·kg^(-1),surpassing that in CK by 91.36%.The content of soil microbial biomass nitrogen(SMBN)fluctuated within a very small range and peaked at 51.90 mg·kg^(-1),surpassing that in CK by 90.70%.The content of soil microbial biomass phosphorus(SMBP)fluctuated sharply at first and then tended to be stable.As the number of restoration years lengthened,the patterns of seasonal variation of the SMBC content in different soil layers were roughly similar,with the highest levels in autumn followed by winter and the lowest in spring and summer.The patterns of seasonal variation of the SMBN content were basically similar and relatively stable.The SMBP content undergone a long,slow accumulation process and its content is higher in winter.It could been inferred that the restored period for around 5 years is a critical period for land restoration and utilization and comprehensive management in the abandoned mining area.

关 键 词：高寒草地 修复年限 土壤微生物生物量 季节 动态变化 

分 类 号：S154.34[农业科学—土壤学]