摘要
通过对沙棘人工造林效果的调查,分析总结出了沙棘人工林的生长规律;沙棘地上生物量随年龄增长之间有Y=0.0002X5-0.0658X4+0.686X3-2.5659X2+2.2501X+3.3027(R=0.96)的规律;沙棘产果量与地上生物量之间有Y=-0.0819+0.2299X-0.0018X2(R=0.99)的规律;沙棘结实和经济系数有随着树龄的增大而增大,石砾河滩至生长10年以后开始逐渐下降的规律;进一步分析了沙棘人工林对改善土壤物理性质的作用和生态水文功能.结果表明:沙棘林可降低土壤容重,增加土壤含水量;10年生沙棘林枯落物厚度平均在1～3!,枯落物重22t/hm2,水容量为绝干重的2.12～4.25倍;蓄水量达13.65～23.37t/hm2;林冠郁闭度在0.7～0.8时,林冠对降雨的截留量为39.3%;林地0～20!土壤的初渗率为16.165㎜/min是对照区的8.7倍;稳渗率为2.4㎜/min是对照区的2.53倍.
The results of investigation of Hippophae rhanmoides subsp.sinensis forests indicate that the ground biomass has the linear relation to the age.The linear regression model equation is:Y=0.0002X5-0.0658X4+0.686X3-2.5659X2+2.2501X+3.3027(R=0.96);and the linear regression model equation of up-ground biomass with the quantity of fruit product is:Y=-0.0819+0.2299X-0.0018X2(R=0.99).It is also showed that Hippophae rhanmoides subsp.sinensis forest can reduce soil capacity weight and increase soil moisture;the average thickness of dead branches and leaves is about 1~3cm in 10 years old of Hippophae rhanmoides subsp.sinensisforest,its weight is 22t/hm2,and the water capacity is 13.65~23.37t/hm2;the canopy interception of rainfall is 39.3% while canopy coverage at 0.7~0.8;The study indicates that the soil elementary permeability rate and steady permeability rate are 16.165mm/min and 2.4mm/min respectively at 0~20cm in Hippophae rhanmoides subsp.sinensisforest land.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2005年第3期189-194,共6页
Journal of Arid Land Resources and Environment
基金
"九五"研究项目
"十五"国家林业局重点科技中试推广项目
关键词
祁连山
人工林
生态经济效益
沙棘
胡颓子科
Hippophae rhanmoides subsp.sinensis
artificial forest
analysis
rule
