The efficiencies of water, soil and fertilizer conservation of public welfare forests in Jinyun County, Zhe-jiang Province in 2000 - 2010 were evaluated based on monitoring data of 117 permanent sample plots by calculating the biomass of six types of forest communities. The results showed that the water-regulation and water-storage capacity of public welfare forest in Jinyun County was 3. 69 x 10s t, cumulative water conservation efficiency was 2. 116 billion yuan, in which efficiencies of water-regulation and water-storage were 1. 577 and 0. 539 billion yuan, respectively. Water conservation capacity of different forest communities decreased in the order showed as PhyUostachys pubescent forest＞Chinese fir forest＞broad-leaved forest > Masson pine forest > broad leaved mixed forest > scrub forest. The soil conservation efficiency of public welfare forest was 0. 12 x 10s t. Reduced nutrients loss amounts of N, P, K and organic matters were 9. 18×103t, 2. 57×103t, 2. 47×105 t and 3. 73×104 t respectively, and the cumulative economic efficiency was 1.428 billion yuan. Soil and fertilizer conservation capacities of different forest communities decreased in the order as broad-leaved forest > broad leaved mixed forest > Phyllostachys pubescent forest＞Masson pine forest＞Chinese fir forest＞scrub forest.%根据浙江省缙云县117个公益林固定小班监测数据,在推算不同群落类型如松林、杉木林、阔叶林、针阔混交林、毛竹林和灌木林等生物量的基础上,估算了公益林植被涵养水源效益和固土保肥效益.结果表明:2000-2010年间缙云县公益林调蓄水量3.69×108 t,水源涵养效益累计21.16亿元.其中调水效益15.77亿元,净化水质效益5.39亿元.不同群落类型涵养水源能力依次为毛竹林＞杉木林＞阔叶林＞松林＞针阔混交林＞灌木林；缙云公益林2000-2010年间固定土壤共0.12×108 t,减少流失的土壤养分纯氮9.18×103t,纯磷2.57×103 t,纯钾2.47×105 t,有机质3.73×104t,累计效益14.28亿元.不同群落类型固土保肥能力依次为阔叶林＞针阔混交林＞毛竹林＞松林＞杉木林＞灌木林.
展开▼
