荒漠绿洲农业生态系统养分平衡与调控  

Balance and control of soil nutrent in agro-ecosystem in the desert oases.

作　　者：王周琼[1] 李述刚[1] 

机构地区：[1]中国科学院新疆生态与地理研究所,乌鲁木齐830011

出　　处：《中国生态农业学报》2001年第2期75-76,共2页Chinese Journal of Eco-Agriculture

基　　金："九五"中国科学院重大项目(KZ951-A1-301);特别支持项目(KZ95T-04-01)部分研究内容

摘　　要：通过研究新疆绿洲农业生态系统历年养分平衡演变情况发现,N盈余为-26.9％～+27.2％,P_2O_5盈余为188,1％,K_2O则亏缺,新绿洲化肥投入已占养分总投入的74.9％,有机养分投入逐年减少。提出了养分良性循环指数(M_N)概念,当前新绿洲M_N只有0.128。阐述了人为调控模式施肥制度,其M_N可达到0.581,有机氮再循环系数(H)接近1。为了培肥地力,模式养分平衡要求N盈余在40％以上,以实现绿洲农业生态系统养分良性循环。Through a research on the surplus and deficent of soil nutrient balance during the period of 1980-1996, the results show that N changed in a range of-26.9-+27.2%,P2O5 was in a big surplus 188.1% , and K2O was deficient, chemical fertilizer has occupied 74.9% of the total spread nutrient and the proportion of organic nutrient is reduced in the new oases. A concept of the good nutrient cycle index(MN) is put forward in the paper, and the current MN is only 0.128 in the new oases in Xinjiang. It is expounded that the MN will be able to reach 0.581 and the recycling coefficient of organic nitrogen(H) will be able to near 1 when fertilizer spreading system by artificial controlled is implemented. In order to fertilize the soil fertility, the model of nutrient balance demands that the surplus of N should be over 40% so as to achieve a good nutrient cycle in the oases agro-ecosystem.

关 键 词：荒漠绿洲农业生态系统 养分平衡 养分良性循环指数 施肥制度 施肥模式调控 

分 类 号：S181[农业科学—农业基础科学] S147.2