摘要
以黄土高原沙棘集中分布的五个县为采样点,在生物量调查和营养化学分析的基础上,对沙棘群落内部营养元素的积累和生物循环规律进行了研究,并计算了沙棘群落的年吸收量、年存留量和年归还量。研究表明,在沙棘群落中,Ca 的循环最快,N 的循环最慢(循环系数分别为0.7299和0.0310)。但由于沙棘根瘤能固定大气中的 N 素,因而保证了沙棘的正常生长需要。
In five counties of the Loess Plateau area(Jingbian,Huanglong and Lingyiou of Shaanxi Province,Qinan of Gansu Province,Jiaokou of Sh- anxi Province),the nutrient elements accumulations and cyclings in seabu- ckthorns community have been studied through investigating the biomasses of seabucthorns and determining the nutrient elements contents.According to the results,the cycling of Ca is the fastest and N is the slowest among the nutrient elements.(The cycling rates are 0.7299 and 0.0310 separately)But because of the nitrogen fixation of rootsnodules,seabuekthorns community could not growth in short supply of N.
出处
《陕西林业科技》
北大核心
1989年第4期17-24,共8页
Shaanxi Forest Science and Technology
