南方红壤旱坡地花生植株对施用氮肥的响应  

Responses of peanut plants to chemical N application rate on sloping upland red soil of southern China

作　　者：赵洁丽[1] 刘勤[2] 张斌[2] 胡锋[1] 毕利东[2] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]中国科学院南京土壤研究所,南京210008

出　　处：《生态学杂志》2007年第9期1344-1349,共6页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2005CB121107);国家"863"专项子课题资助项目(2002AA2Z4331)

摘　　要：选用多年夏花生-冬蔬菜种植制度下的典型红壤旱坡地,通过田间试验,研究了5种氮肥水平下花生根系的形态特征、固氮能力、植株生物量以及荚果产量。结果表明:不同氮肥施用量对花生植株生物量及荚果产量影响均不显著(P=0.091);而不同处理的土壤固氮酶活性与氮肥施用量间呈极显著的负相关(R2=0.88,P=0.005);单株花生根系总长度、总表面积、总分叉数及根尖条数均随氮肥施用量的增加而减小,且与单株花生根瘤生物量呈极显著(P<0.001)正相关。A field experiment was conducted on a typical sloping upland red soil to study the root morphology, nitrogen fixation, biomass, and pod yield of peanut plants under five levels of chemical N application rate. On this soil, the cropping system summer peanut-winter vegetable has been carried out for many years. The results showed that N application rate had no significant effect on the total biomass and pod yield of peanut plants （P =0. 091 ）, but had significant negative effect on the special actetylene reduction in soil （R^2 = 0. 88, P =0. 005）. The total length, total surface area, and the numbers of branches and tips of peanut roots decreased significantly with increasing N application rate, and had significant positive correlation with nodule biomass （P 〈0. 001）.

关 键 词：红壤 花生 氮肥 固氮酶活性 根系形态 

分 类 号：S565.2[农业科学—作物学]