摘要
近四十年来，沙坡头地段沙漠绿洲化进程指明了该地段固沙造林逐渐逼近环境容纳量的三级近似过程，这种过程从无序走向有序的序参量是Ｈ＿（ｔ）＝１．３１３８ｅ￣１．０５７５／ｔ。该地段绿化进程的极限熵是Ｈ＿（ｔ）＝１．３１３８，相当于造林后第１０年的年降水量约１８６．２ｍｍ，沙层含水量１－２％的环境容纳量。
The revegetation process on the sand dunes of the Tenger Desert in the ShapotouArea,has been carried on for 40 years. The results showed that the vegetation process hasreached the third stage of the approximate period of the water environmental capacity. It isan open self-tissue structure process from chaos to order, formed by the non-equilibriumecosystem,and can be expressed by a rnodel H(t)=1.3138e￣1,0576/t.The equilibrium entropyfor the revegetation process in this area was estin1ated to be H(t)=1.3138, approximatelyequal to the water environmental capacity in the tenth year after plantation with the l86.2mm of annual precipitation and the 1-2% of soil water content in the root layer of thesand dunes.
出处
《干旱区资源与环境》
CSCD
1995年第3期88-92,共5页
Journal of Arid Land Resources and Environment
基金
中国科学院沙坡头沙漠试验研究指导基金
中国科学院兰州沙漠研究所所长基金
关键词
沙漠
绿洲化
熵
环境容量
Desert, Revegetation,Environmental capacity,Entropy.
