摘要
以沙珠玉治沙试验林场内人工植被恢复的长期定位监测试验为基础,将不同林龄(3、12、21、30、42a和51a)的人工柠条(Caragana korshinskii)林地作为研究对象,把农田和沙丘作为对照,测定了土壤理化性质和柠条营养指标的变化情况,探讨了人工柠条林对沙地的恢复改良效果、高寒沙地恢复需要的时间和柠条的可开发利用潜力。结果表明:随着柠条林龄的增加,土壤质地得到显著改善,土壤有机质的含量显著增加(p<0.05),与农田0~5cm层土壤理化性状相比,30年生柠条林地的表层土壤已恢复至农田水平,土壤有机质随着土层深度增加,改良效果存在时间上的滞后性;30~42年生柠条林的粗蛋白总量达到最高,结合沙地土壤恢复状况,建议在超过30年生的柠条林区实施平茬措施,进行适度开发利用,提高其生态经济价值,以促进高寒沙区绿洲的可持续发展。
Taking artificial Caragana korshinskii plantations with different ages(3,12,21,30,42 and 51-year-old)as research objects,cultivation land and sand dune as control,a long term experiment was conducted in Shazhuyu Forest Farm,which is located in the oasis border of alpine sandy area in Qinghai.Soil physico-chemical properties and nutrient indicators of C.korshinskii as well as their dynamics were determined to examine the effects of vegetation restoration of C.korshinskii and its utilization potential.The results show that:with the increase of vegetation restoration time,the soil texture was greatly improved,soil organic matters increased significantly(p<0.05).Compared with farmland(0-5cm layer),soil physicochemical properties of 30-year-old plantation restored to the level of cultivation land.Soil organic matter increased with soil depth,and a time lag in the soil improvement was observed;The content of total crude protein reached the highest level in C.korshinskii plants with the ages of 30-to 42-year-old.Considering the recovery situations of sandy soil,it was suggested that C.korshinskii plants over 30-year-old could be cut off for further utilization to increase the economic benefit of ecological restoration,and to promote the sustainable development of the region.
出处
《西北林学院学报》
CSCD
北大核心
2016年第2期149-153 301,301,共6页
Journal of Northwest Forestry University
基金
国家"十二五"科技支撑课题(2012BAD16B0105)
关键词
高寒沙区
绿洲边缘
柠条
土壤改良
开发利用
alpine sandy land
oasis border
Caragana korshinshii
soil improvement
exploitation
