内蒙古赤峰市敖汉旗大五家流域森林涵养水源功能与林分因子的相关性研究

Study on the Relationship between Water Conservation Function and Stand Factors in Dawujia Watershed,Inner Mongolia

以内蒙古赤峰市敖汉旗大五家流域内不同林分类型为研究对象,以林分涵养水源功能为目标,研究涵养水源功能与林分因子的相关性,旨在通过林分因子来评判森林涵养水源功能的高低。结果表明:平均树高、胸径、冠幅、冠层厚度、公顷蓄积量、年蓄积生长量、郁闭度、地被物盖度、下木盖度、群落结构的相关关系最密切,影响也最大,该10个林分因子可作为评价不同林分类型涵养水源功能高低的因子。与枯落物层涵蓄水分能力相关性较大的林分因子为胸径(0.734 7)、年蓄积生长量(-0.806 8)、冠层厚度(0.464 7)、冠幅(-0.674 6)、群落结构(-0.370 0)、地被物盖度(0.677 6)、公顷蓄积量(-0.617 9)、郁闭度(-0.587 2);土壤层涵蓄水分能力相关性较大的林分因子为树高(0.592 1)、胸径(0.275 0)、公顷蓄积量(0.827 5)、郁闭度(0.317 3)、年蓄积生长量(0.767 7)、冠幅(0.749 0)。枯落物层有效拦蓄水量和土壤层有效涵蓄水量相关性较大的因子为郁闭度、公顷蓄积量、下木盖度、胸径、冠幅;林地总的蓄水量相关性较大的因子为地被物盖度、公顷蓄积量。

Taking different forest types in Dawujia Watershed of Ao＇ han County, Chifeng city, Inner Mongolia as the research object, the correlation between water conservation function and stand factors was studied in order to e- valuate the level of water conservation function by stand factors. The results of research show that the average height, the average diameter at breast height, crown width, crown thickness, volume per hectare, annual volume increment, canopy density, ground cover coverage, undergrowth coverage, and community structure are the most important factors impacting and related to water conservation function. These ten key factors can be used to evaluate the water conservation function of forest. For litter layer, the stand factors closely related to water conservation func- tion are the average diameter at breast height （0. 734 7）, annual volume increment （ - 0.806 8）, crown thickness （0.464 7）, crown width （ - 0.674 6）, community structure （ - 0.370 0）, litter cover （0.677 6）, volume per hectare （ -0.617 9）, and canopy density （ -0. 587 2） ; For soil layer, the stand factors closely related to water conservation function are the average height（0.592 1 ）, the average diameter at breast height （0.275 0）, volumeper hectare （0. 827 5）, canopy density （0. 317 3）, annual volume increment （0. 767 7）, and crown width （0. 749 O） ;For both the litter layer and soil layer, the stand factors closely related to water conservation function are canopy density （0.831 7 ）, volume per hectare （0.817 2）, undergrowth coverage （0.652 5 ）, average diame- ter at breast height （0. 644 7）, and the crown width （0.521 2） ; From the viewpoint of the total water storage ca- pacity of forest, the most important factors are the ground cover coverage （0.462 6） and the volume per hectare （0. 315 5）.