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不同自然植被的水土保持能力可作为制定水土保持目标的重要参考.通过应用137Cs技术测算卧龙自然保护区不同自然生态系统过去40年的土壤再分配情况,以此量化可代表不同气候类型的自然植被的水土保持能力.卧龙保护区地处四川盆地向青藏高原的过渡地带,植被类型丰富.研究选取了可以代表适温针阔叶混交林、耐寒落叶针叶林、耐寒灌丛、耐寒常绿针叶林、高山草甸的五个自然生态系统,每个系统剖面的土壤净侵蚀速率依次是0.17,0.16,0.13,0.11和0.06kg/(m2·a),它们的水土保持能力则正好与此顺序相反.由于降雨量随海拔升高而增加,使得不同生态系统的137Cs背景值随海拔不同而在1658.2~3707.2Bq/m2之间变化.在相似的气候带内制定水土保持策略时,这些植被的水土保持效果都是必须要参考的.
Soil and water conservation capacity of different natural vegetation can be used as an important reference for making soil and water conservation goals.Using 137Cs technology to estimate the redistribution of soil in different natural ecosystems in Wolong Nature Reserve over the past 40 years so as to quantify natural vegetation that can represent different climate types The Wolong Nature Reserve is located in the transitional zone from Sichuan Basin to the Qinghai-Tibet Plateau, and has rich vegetation types. The study selected representative forest species of temperate-needle coniferous-broadleaved mixed forest, hardy deciduous coniferous forest, The results showed that the net soil erosion rate of each system section was 0.17, 0.16, 0.13, 0.11 and 0.06 kg / (m2 · a) respectively, and their soil and water conservation capacity coincided with this In the reverse order, the 137 Cs background values of different ecosystems varied from 1658.2 to 3707.2 Bq / m2 with different altitudes due to the increase of rainfall with elevation.When developing soil and water conservation strategies in similar climatic zones, The effect of soil and water conservation must be for reference.