黄土高原半干旱区退耕地沙棘林密度调控  

Controlling Seabuckthorn Densities for Returning into Woodland in Semi-arid Region of the Loess Plateau

作　　者：吴宗凯[1] 刘广全[1,2,3] 匡尚富[2,3] 焦醒[2,3] 周海光[2,3] 

机构地区：[1]西北农林科技大学,陕西杨凌712100 [2]国际泥沙研究培训中心,北京100048 [3]中国水利水电科学研究院,北京100048

出　　处：《国际沙棘研究与开发》2009年第3期5-10,共6页

基　　金："十一五"国家科技支撑计划(2006BAD09B06;2006BAD03A0308);水利部"948"项目(200207)联合资助

摘　　要：本文以黄土高原半干旱地区吴起县北部沙棘人工成林为研究对象,定位观测了沙棘林地林木蒸腾、土壤蒸发及土壤水分状况等,根据水资源承载能力确定退耕地沙棘林适宜密度及其动态调控。结果表明:沙棘林分生长季节内,丰水年土壤贮水量总体为盈余;平水年的同期降水不能满足林地蒸散消耗;枯水年土壤水分明显亏缺。该地区沙棘林稳定群落密度为1445株(丛)/hm2,初植密度为2223株(丛)/hm2。造林密度过大是造成土壤水分亏缺、植被生态效益和经济效益难以发挥的重要因素。The paper studied the reasonable seabuckthorn densities and it＇s controlled for returning into woodland according to water resources carrying capacity in the semi-arid region of the Loess Plateau, which observed the transpiration, soil evaporation and soil moisture in the artificial seabuckthorn stands. The results showed that the soil water had surplus in the wet year, could not be met the consumption of stand evapotranspiration in the normal year, and was deficient in the dry year during the seabuckthorn growing period. The steady stand density could be 1445 trees/hm^2 , and be the initial planting densities 2223 trees/hm^2. The too heavy density of plantation in this region caused the soil moisture deficit and the difficult for forest to play a role in ecosystem and economics.

关 键 词：黄土高原 半干旱区 沙棘林 密度调控 

分 类 号：Q945[生物学—植物学]