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对甘肃景泰不同种植密度的10年龄人工柽柳(Tamarix chinensis)林地,监测根周及行间土壤水分含量,并对监测资料进行量化分析。结果表明:(1)在垂直剖面上,根周土壤水分含量层次可分为蒸发层0~40cm、活跃层40~180cm和相对稳定层180~200cm;行间土壤水分含量层次可分为蒸发层0~40cm、活跃层40~120cm、相对稳定层120~200cm。(2)林地土壤水分主要靠天然降水补充,土壤水分储量年际变化随种植密度由高到低呈亏空-富余-亏空的变化趋势;综合考虑行距-土壤水分储量回归方程及冠积-行距回归方程,得出景泰地区合理种植密度为1 923株·hm-2。结果可为干旱区生态恢复和退耕还林提供科学依据。
The 10-year-old Tamarix chinensis woodlands with different plant densities in Jingtai of Gansu Province were monitored for soil moisture content during the rhizosphere and intercourse period. The monitoring data were quantitatively analyzed. The results showed as follows: (1) In the vertical section, the soil moisture content in the root circumference could be divided into 0 ~ 40cm of evaporating layer, 40 ~ 180cm of active layer and 180 ~ 200cm of stable layer. 0 ~ 40cm, active layer 40 ~ 120cm, relatively stable layer 120 ~ 200cm. (2) The soil moisture in woodland mainly relies on natural precipitation, and the interannual variation of soil water storage shows a trend of deficit-surplus-deficit with high planting density; Considering the regression equation of row spacing-soil water storage and the regression of crown plot- The results showed that the reasonable planting density in Jingtai region was 1 923 plants · hm-2. The results can provide a scientific basis for ecological restoration and returning farmland to forests in arid areas.