摘要
民勤全县共有人工梭梭林近3.5万hm2,占人工林总面积的51.5%,在民勤固沙林中占主导地位.但目前除水库与环河周围外,人工梭梭林均出现不同程度的退化现象,并表现为建群种梭梭光合强度减弱、群落盖度降低、梭梭种群优势度下降、林地土壤含水率下降、组成群落的物种多样性减少、地表土壤结皮破坏、风蚀作用增强等特征.梭梭林的退化,直接威胁到民勤绿洲的生存与发展,其恢复与重建成为当前一项十分重要而紧迫的任务,为此提出控制梭梭林密度、人工集雨、布设粘土或新型材料沙障、引进与培育抗旱新品种、特殊区域应用喷灌技术补水、补充水源不断恢复民勤地区的地下水位等措施,以期达到恢复与维持梭梭群落稳定发展的目的.
The artificial communities of Haloxylon ammodendron which total area is about 0.035 million hm^2, is a dominant community in the sand building forestry in Minqin County, and occupies 51.5% of the total area of artificial forestry. With the exception of Haloxylon ammodendron distributed around the Hongyashan reservoir and Shiyang river, the others occurred degeneration and their photosynthetic rate, soil moisture, vegetation canopy and species diversity decreased. The soil crust in Haloxylon ammodendron woodland was destroyed, and wind erosion increased. According to the characteristics and status of the degenerated artificial Haloxylon ammodendron communities, some pertinence restoration measures, such as controlling the density of Haloxylon ammodendron communities, breeding and introducing new species that tolerate serious drought, using drip irrigation technology in some special area, applying clay and new material sand barrier, and gradually restoring water table of Minqin county, were putted forward to restore and maintain artificial Haloxylon ammodendron communities.
出处
《西北植物学报》
CAS
CSCD
2003年第12期2107-2112,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家 "十五" 攻关项目 (2002BA517A09)
国家自然科学基金项目 (39990490) 资助.
关键词
民勤绿洲
人工梭梭林
固沙林
退化特征
恢复对策
Minqin
Haloxylon ammodendron
sand building forestry
characteristics of the degenerated artificial Haloxylon ammodendron communities
restoration strategies
