摘要
东北羊草（Ｌｅｙｍｕｓｃｈｉｎｅｎｓｉｓ）草原土壤微生物生物量５月份较小，随着夏季的到来逐渐增大，增大系数分别为０．７３５和０．６４３，８月份有最大值（２５．４１×１０^（－３）ｇ／ｇ·干土）；进入秋季生物量逐渐减小，减小系数为０．７０５，１０月份最小（５．８９×１０（－３）ｇ／ｇ·干土）．灰色分析表明，在９种环境因素中土壤含水量、土壤温度、水解氮、速效钾、活性有机质和植物生物量对微生物生物量有较大的灰色关联度，是优势因素，而土壤ｐＨ值、电导率和有效磷的灰色关联度较小．是微生物总生物量的限制因素。根据灰色分析的结果，建立了微生物生物量的回归模型：Ｙ＝－２８．７１６９－１．１９５３Ｘ１＋３．２０７４Ｘ２，Ｒ＝０．９７８６。
On the Leymus
chinensis grasslarid in northeastern China,the soil microbial biomass keeps a smaller value
in May,grdually increased:summer comes the incremental coeffi-cent separately is 0.735 and
0. 643,the biggest value of microbial biomass is in August(25. 41×10(-3)g/g dry soil),and
gradually decreases as autum comes,the smallest value(5. 89×10(-3)g/g dry soil)is in
Octobor,the declining coefficient is 0.705.The Grey analysis indicated that among nine
environment factors,soil water content,soil temper-ature,plant biomass,hydroiyted
nitrogen,quick acting Postassium and active organic matter keep a bigger Grey connection
degree opposite microbial biomass separtely,are major factors,aoil pH value,electric
conduction rate and effective phosphorus keeps a smaller Grey connection degree
separately,are the limitted factors of microbiaI total biomass.We establihed the microbiai
biomass regression model according to the result of Grey
analysis:Y=-28.7169-1.1953X1+3.2074X2,R=0.9786.
出处
《中国草地》
CSCD
1996年第1期10-14,共5页
Grassland of China
基金
国家自然科学基金
关键词
羊草草原
环境因素
微生物生物量
灰色分析
Leymus chinensis
grassland,Environment factors,Microbial biomass,Grey analysis
