苜蓿草地土壤干层对土壤脲酶活性和土壤蛋白酶活性的影响  

Effects of Dry Soil Layers on Activity of Soil Urease and Protease in Alfalfa Grassland

作　　者：王晓凌[1,2] 陈明灿[1] 李凤民[2] 张雷[1] 王景阳[1] 李小朋[1] 

机构地区：[1]河南科技大学农学院,河南洛阳471003 [2]兰州大学干旱草地生态教育部重点实验室,兰州730000

出　　处：《水土保持研究》2007年第4期445-448,450,共5页Research of Soil and Water Conservation

基　　金：教育部重大科技创新基金;河南科技大学人才科学研究基金.

摘　　要：从2000年10月到2004年10月,通过大田试验研究了半干旱黄土高原地区4年生苜蓿草地、14年生苜蓿草地、苜蓿-作物轮作农田以及常规耕作农田中土壤全氮含量、土壤微生物量碳和氮含量、和土壤脲酶活性和土壤蛋白酶活性。结果表明,土壤微生物量碳和氮含量苜蓿草地最高,其次苜蓿-作物轮作系统,而常规耕作农田最低。土壤尿酶活性和土壤蛋白酶活性14年生苜蓿草地显著低于4年生苜蓿草地和苜蓿-作物轮作系统。土壤含水量14年生苜蓿草地显著低于其它处理。长时期苜蓿草地出现的土壤干层严重影响着土壤尿酶和土壤蛋白酶活性,威胁着土壤氮素的转化。与常规耕作相比,苜蓿-作物轮作系统不但土壤微生物量较高,而且土壤酶活性也较高。A field experiment was conducted from October 2000 to October 2004 to examine soil total N, soil microbial biomass C and N, and soil urease and protease activity among the soils of alfalfa grassland for 1-4years （AS4）, alfalfa grassland for 11- 14years （AS14）, millet-spring wheat-potato rotation after 10 years of alfalfa grassland （MWPPe） ; millet-potato-spring wheat after 10 years of alfalfa grassland （MPWC） and conventional farming system （CS） in the semiarid Loess plateau region of Northwest China. The results showed that microbial biomass C and N, in soils of AS4 and AS14, secondly in MWP and MPW, and were the lowest in CS. Soll catalase activity, soil urease activity, soil protease activity and soil water content were significantly lower in AS14 than in AS4, MWP and MPW. Soil dry layers in long term alfalfa grassland influenced soil enzyme activity greatly, and threated soil N transformation. Compared to CS soil microbial biomass C and N, soil enzyme activity of MWP and MPW were high.

关 键 词：苜蓿作物轮作 微生物生物量 土壤酶活性 土壤有机碳 土壤肥力 

分 类 号：S155.47[农业科学—土壤学]