黄土丘陵区人工林养分循环特*征  

Biological Cycling of Nutrients of Plantation in Hilly Loess Plateau

作　　者：夏菁[1] 魏天兴[1] 陈佳澜[1] 尹娜[1] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室北京林业大学,北京100083

出　　处：《水土保持学报》2010年第3期89-93,共5页Journal of Soil and Water Conservation

基　　金：国家"十一五"科技支撑计划(2006BAD03A1206);山西吉县森林生态系统国家野外科学观测研究站项目;水土保持科技创新平台开放基金

摘　　要：通过对山西省吉县蔡家川流域人工刺槐林和人工油松林养分元素积累与分布和生物循环进行研究,结果表明:(1)黄土丘陵区人工林乔木层不同器官养分元素含量以树叶为最高,树干最低;各器官中养分元素含量N最高,P最低,凋落物层养分含量总计约占整个林下层养分含量的26.69%～37.36%;(2)黄土丘陵区人工林生态系统养分总贮量为3 238.548 kg/hm2,乔木层、灌木层、草本层和凋落物层分别72.24%,12.31%,8.70%和6.74%,说明该地区人工林群落结构简单,乔木层树种单一;(3)黄土丘陵区人工林年吸收量、归还量、存留量分别为256.825,110.328,146.497 kg/(hm2.a),年归还量占年吸收量的42.96%,凋落物的回归量不到吸收量的1/2。(4)循环系数为0.364～0.398,循环速率依次为P>Mg>K>Ca>N。The accumulation,distribution and biological cycling of nutrients in artificial Pinus tabulaeformis forests and artificial Robinia pseucdoacacia forests were stayed in hilly loess region in Shanxi province.The results were shown as follows：（1）The nutrient content of plantation in hilly loess regions was different in different organs,highest in the leaves and lowest in the stems.The content of N and Ca was the highest,and P were the lowest.The nutrient content of litter layer was account for 26.69%～37.36% of the total undergrowth.（2）The total accumulation of nutrients in the plantation was 3 238.548 kg/hm2,the nutrient content accumulations percent of tree,bush,herb and litter were 72.24%,12.31%,8.70% and 6.74%,respectively.This showed that the plantation community structure is simple and the structure of tree layer is single.（3）The amount of uptake,retention and return of nutrient content in the plantation were 256.825,110.328,146.497 kg/（hm2·a）,respectively.The amount of retention of nutrient content was accounting for 42.96% of the uptake.（4）The cycling coefficient was 0.41,and the cycling speed was： PKMgCaN.

关 键 词：养分含量 养分循环 刺槐林 油松林 黄土高原 

分 类 号：S718.55[农业科学—林学]