围封对草地凋落物分解速率和N、P、K含量的影响  

Study on litter decomposition rates and N,P,K content of litter in different years of enclosure in desert steppe

作　　者：王蕾 张宇 许冬梅[2] 张娜 

机构地区：[1]宁夏草原工作站,宁夏银川750011 [2]宁夏大学农学院,宁夏银川750021

出　　处：《草业科学》2013年第10期1508-1512,共5页Pratacultural Science

基　　金：国家自然科学基金(30960268);国家973计划前期研究(2010CB434805)

摘　　要：以盐池县退化荒漠草地为对象,对未围封和不同围封年限的草地凋落物进行研究。结果表明,草地凋落物的积累量随时间的延长而增加,达到增长峰期(9-10月)后逐渐降低;草地凋落物的分解速率随分解时间的延长逐渐降低,围封草地凋落物分解速率高于未围封草地;草地凋落物的自然持水率随着分解时间推移,不断升高达到一个峰值后逐渐降低;凋落物的全氮、全磷含量随围封时间延长而降低,全钾含量在围封5年时含量最低。This study examined the litter of degraded desert steppe among different years of enclosure and the unenclosed grassland in Yanchi. It showed that the litter accumulation reached a maximum in September and October then declined with the time increasing. The litter decomposition rate was gradually decreased with the time. The litter decomposition rates of the enclosed grassland were higher than that of the unenclosed. With time increasing, natural water holding rates of litter reached a maximum and then declined gradually. Both the total nitrogen content of litter and the total phosphor content of litter of the enclosed grassland were lower than that of the unenclosed. The total kalium content of litter reached a minimum at the 5th year.

关 键 词：围封年限 荒漠草原 凋落物 

分 类 号：S812[农业科学—草业科学]