东北地区不同纬度农田土壤碱解氮的剖面分布  

Profile distribution of alkali-hydrolyzed nitrogen in farmland soils of Northeast China along a latitudinal gradient

作　　者：施春健[1] 庄秋丽[1] 李琪[1] 梁文举[1] 姜勇[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《生态学杂志》2007年第4期501-504,共4页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2005CB121105);国家自然科学基金资助项目(30670379)

摘　　要：为研究农田土壤碱解氮的含量及其分布,以东北玉米带不同纬度农田土壤为对象,研究了100cm深度范围内碱解氮含量垂直分布及纬向分异特征。结果表明:土壤碱解氮主要分布在0～60cm土层中,各样点碱解氮含量随土壤深度的增加而减少;除公主岭点外,其它各点0～60cm的3个土层间碱解氮含量差异显著(P<0.05);碱解氮含量与有机碳、全氮含量极显著正相关(P<0.01),说明土壤碱解氮含量及其分布主要受土壤有机质和氮素水平的影响。0～20cm土层碱解氮含量具有随纬度增加而增加的趋势,气候条件和土壤类型的差异是导致其纬向分布差异的主要原因。The vertical distribution and latitudinal differentiation of alkali-hydrolyzed nitrogen m the profile down to 100 cm depth of maize soils in Northeast China was investigated along a latitudinal gradient. The results showed that soil alkali-hydrolyzed N was mainly distributed at the depth of 0-60 cm, and decreased with soil depth. Except for the Gongzhuling site, the soil alkali-hydrolyzed N content in other sampling sites was significantly different （ P 〈 0.05 ） among the 3 layers at the depth of 0-60 cm. Soil alkali-hydrolyzed N had a significant positive correlation （P 〈 0. 01 ） with soil organic carbon and total N, indicating that its content and distribution was mainly affected by soil organic matter and total N levels. Soil alkali-hydrolyzed N content increased with increasing latitude, and climate condition and soil type were considered as the main reasons that induced the latitudinal differentiation of soil alkali-hydrolyzed N.

关 键 词：碱解氮 剖面分布 纬度梯度 黑土 棕壤 

分 类 号：S153[农业科学—土壤学]