抚育强度对大兴安岭落叶松林枯落物持水能力及水质的影响

Water Conservation under Different Fostering Intensity in Timber Forest of Daxing'an Mountains

试验样地设置在大兴安岭地区新林林业局新林林场106、107、108、109林班内。以大兴安岭落叶松针叶林为研究对象,将立地条件相同的原始林样地作对照,选取抚育强度为6.23%、16.75%、20.86%、27.85%、40.01%、56.51%、67.25%7个样地,收集枯落物并测定水质,应用灰色关联度法,综合评价抚育强度对枯落物及水质影响。研究表明,抚育强度为40.01%时,枯落物蓄积量最大,为8.66 t/hm2,水土保持能力最佳,同时与水质指标的灰色关联度最高（0.955）,即水源水质最好;抚育强度为27.90%时,枯落物有效拦蓄水量最大,为17.77 t/hm2。综合评价结果是抚育强度在27.90%-40.01%时的抚育效果最好。

In 106 th,107 th,108 th,109 th block of Xinlin Bureau,Daxing＇an Mountains,we took the Larix gmelinii to choose eight subjects of different fostering intensities（ 6. 23%,16. 75%,20. 86%,27. 85%,40. 01%,56. 51%,and 67. 25%）with CK. By collecting the litter and measuring the water quality,we used grey system theory to evaluate the water quality comprehensively. When the fostering intensity was 40.01%,the litter accumulation of water absorption was the largest of 8.66 t / hm2 with the best conservation capacity of the water and soil. In 27.90%,the efficient storage was best with 17.77 t / hm2.When the fostering intensity was in 27.90%-40.01%,the fostering effect was the best.