摘要
通过对河西走廊天然胡杨林立地类型、分布、生长、更新特征及土壤因子调查,分析河西走廊天然胡杨分布、更新特征及其与土壤因子的关系。结果表明:(1)河西走廊天然胡杨林分布以疏勒河、黑河、石羊河三大流域的河岸阶地、古河道阶地及各流域下游绿洲耕地边缘为主。根据土地利用现状和立地条件,将现有天然胡杨林分为弃耕地林地、耕地及灌渠周围林地、现河道沿岸林地、古河道及戈壁低洼地林地4个类型。(2)耕地及灌渠周围林地和现河道沿岸林地胡杨生长、龄级构成及幼苗更新均优于弃耕地林地和古河道及戈壁低洼地林地;仅单位面积更新幼苗株数而言,耕地及灌渠周围林地最多,均值为22.13,其次是弃耕地林地20.92、现河道沿岸林地10.50,古河道及戈壁低洼地林地最少,为1.33。(3)不同类型胡杨林中,土壤因子各不相同,在0~20 cm及20~40 cm土层中,耕地及灌渠周围林地、现河道沿岸林地土壤含水量均高于弃耕地林地和古河道及戈壁低洼地林地,且具显著性差异(P<0.05);0~20 cm土层中,土壤速效P表现为:现河道沿岸林地<古河道及戈壁低洼地林地<弃耕地林地和耕地及灌渠周围林地,20~40 cm土层中,现河道沿岸林地土壤速效P明显低于其他3类林地(P<0.05);全N与有机质含量在不同类型林地中无显著差异(P>0.05);土壤电导率在0~20 cm和20~40 cm土层中,表现为弃耕地林地显著小于其他3类林地(P<0.05),尤其40~60 cm土层中,古河道及戈壁低洼地林地显著大于其他3类林地(P<0.05);不同类型林地中,除0~20 cm土层中粗沙粒外,各土层中耕地和灌渠周围林地土壤黏粒、粉粒、粗沙粒占比均高于其他3类林地(P<0.05)。(4)土壤水分、速效P含量与胡杨中龄、幼龄及幼苗株数呈正相关关系(P<0.05)。加强林地管护,适时疏枝、去除枝枯梢、间伐及灌溉补水,可推动胡杨林可持续发展。
A thorough investigation of the distribution of natural Populus euphratica,tree growth,regeneration characteristics,soil types,and factors in the Hexi Corridor was conducted.The distribution and regeneration status of natural P.euphratica in the Hexi Corridor,as well as its relationship with soil factors,were then examined.The results showed that:(1)Natural P.euphratica forests in the Hexi Corridor were mainly distributed in riparian terraces,ancient river terraces and the edge of oasis cultivated land in the lower reaches of Shule River,Black River,and Shiyang River.There are four main types of forest land:abandoned land,the land around cultivated fields and irrigation canals,land along the current river course,and land among ancient river course and Gobi low-lying land.(2)The growth status,age structure,and seedling regeneration of P.euphratica in the land around cultivated fields and irrigation canal,land along the current river course are better than those of the abandoned land,and among ancient river course and Gobi low-lying land.In terms of the number of renewed seedlings per unit area,the land around the cultivated field and irrigation canal was the largest,with an average value of 22.13,followed by abandoned cultivated land(20.92),land along the current river course(10.50),and among ancient river course and Gobi low-lying land(1.33).(3)Different types of P.euphratica forests have different soil factor contents:(i)Available P:In the 0-20 cm soil layer,the soil available phosphorus showed the trend as;land along the current river course<land among ancient river course and Gobi low-lying land<abandoned land,land around cultivated field and irrigation canal cultivated land;in the 20-40 cm soil layer,land along the current river course had significant less available phosphorus than the other three types of forest land(all P<0.05);(ii)Moisture content was higher in the land around cultivated fields and irrigation canals,and land along the current river course than in abandoned land,land among ancient river cou
作者
马俊梅
马剑平
满多清
郭春秀
张裕年
赵鹏
王飞
李元星
MA Junmei;MA Jianping;MAN Duoqing;GUO Chunxiu;ZHANG Yunian;ZHAO Peng;WANG Fei;LI Yuanxing(Gansu Desert Control Research Institute,Lanzhou 730000,Gansu,China;State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Wuwei 733000,Gansu,China)
出处
《干旱区研究》
CSCD
北大核心
2023年第2期224-234,共11页
Arid Zone Research
基金
省重点研发计划项目(20YF8FA105)
省重点研发计划项目(21YF5NA034)
国家自然科学基金(31860175)。
关键词
河西走廊
天然胡杨
分布更新
土壤因子
Hexi Corridor
natural Populus euphratica
distribution renewal
soil factor
