Evaluation of Water Conservation Function of Forest Ecosystem in Luonan County

基于森林资源二类调查数据，运用综合蓄水能力法，估算了洛南县不同类型森林生态系统的林冠截留降水量、枯落物持水量、土壤蓄水量及总水源涵养能力。结果表明：① 洛南县森林生态系统总涵养水源能力1.44 × 108 m3，单位面积水源涵养能力1042.76 t/hm2，经济价值达5.45亿元/a，效益非常显著；② 区域内不同类型森林总涵养水源能力针叶林最高，占62.2%，而混交林的单位面积水源涵养能力最高；③ 区域内不同龄组森林生态系统水源涵养能力中龄林最大，占54.59%，过熟林最小。单位面积水源涵养能力成熟林最大，幼龄林最小。 Based on the two types of forest resources survey data, the comprehensive water storage capacity method was used to estimate the canopy interception precipitation, litter water holding capacity, soil water storage capacity and total water conservation capacity of different types of forest ecosystems in Luonan County. The results showed that: ① The total water conservation capacity of forest ecosystem in Luonan County was 1.44 × 108 m3, the water conservation capacity per unit area was 1042.76 t/hm2, the economic value was 545 million yuan/a, and the benefit was very significant; ② Coniferous forest with the highest total water conservation capacity of different types of forests in the region accounted for 62.2%, while mixed forest had the highest water conservation capacity per unit area; ③ The water conservation capacity of forest ecosystem in different age groups was the highest in middle age forest (54.59%) and the lowest in over-mature forest. Water conservation capacity per unit area is the largest mature forest, the smallest young forest.