封育年限对毛竹林凋落物和土壤持水效能的影响

  目的  探讨自然封育对毛竹Phllostachys edulis林凋落物和土壤持水效能的影响，为评价不同类型毛竹林水源涵养功能提供科学依据。  方法  以空间代替时间的方法，以浙江省杭州市余杭区不同封育年限(10、20、30 a)和常规经营(对照)的毛竹林为对象，研究不同封育年限对毛竹林凋落物层和土壤层持水性能的影响。  结果  自然封育提高了毛竹林凋落物的持水能力，与对照相比，毛竹林凋落物储量、最大持水量、有效拦蓄量分别增加了85.7%~300.7%，92.0%~402.8%，87.7%~377.6%(P＜0.05)。自然封育后毛竹林土壤的非毛管孔隙度显著增大(P＜0.05)，表层(0~30 cm)土壤容重显著降低(P＜0.05)，毛竹林土壤非毛管持水量显著增加(P＜0.05)；自然封育20 a后表层(0~30 cm)土壤最大持水量比常规经营显著提高了18.1%~33.2%(P＜0.05)。  结论  自然封育能显著提高凋落物的持水能力和表层土壤的持水效能，且随着封育年限的延长水源涵养功能增强。图4表4参25

Effects of enclosure duration on litter and soil water holding capacity of Phyllostachys edulis forest

  Objective  This study aims to explore the effects of natural enclosure on forest litter and soil water holding capacity of Phllostachys edulis forest and provide scientific basis for evaluating water conservation function of different types of Ph. edulis forests.  Method  Using the method of space-for-time, and taking Ph. edulis stands in Yuhang District, Hangzhou City of Zhejiang Province as the research object, effects of different enclosure periods (10, 20, 30 years) and conventional management (control) on water holding capacity of litter layer and soil layer of Ph. edulis forest were studied.  Result  Compared with ck, the litter reserves, maximum water holding capacity and effective retention capacity after natural enclosure increased by 85.7%?300.7%, 92.0%?402.8%, 87.7%?377.6%, respectively (P＜0.05). After natural enclosure, the soil non-capillary porosity increased by 27.52%?137.74% (P＜ 0.05), the bulk density of top soil (0?30 cm) decreased by 16.53%?26.52%(P＜0.05), and the water holding capacity of non-capillary pores in soil (0?60 cm) increased by 50.2%?106.3% (P＜0.05). The maximum water holding capacity of surface soil (0?30 cm) after 20 years of natural enclosure increased by 18.1%?33.2% (P＜0.05).  Conclusion  Natural enclosure can significantly improve the water holding capacity of litter and the water retention efficiency of surface soil, and the water conservation function is enhanced with the extension of enclosure period. Ch, 4 fig. 4 tab. 25 ref.]