江西退化红壤区3种森林恢复模式的枯落物和土壤表层水文功能研究
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温林生(1996-),男,硕士研究生,主要从事生态水文及同位素水文研究。E-mail:825906052@qq.com

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江西省林业厅科技创新专项(201808);国家自然科学基金项目(31860236)


The Hydrological Functions of Litter and Soil Surface of Three Forest Restoration Modes in Degraded Red Soil Area of Jiangxi Province
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    摘要:

    为探讨退化红壤区植被恢复对枯落物层及土壤层的水源涵养功能影响,进一步揭示退化生态系统植被恢复的功能效应,采用室内浸水法和环刀法分别测定了3种恢复模式(木荷纯林、马尾松纯林、马尾松间伐补木荷林)的枯落物层与0—20 cm土层的持水能力。结果表明:(1)马尾松纯林的枯落物层蓄积量最大(7.91 t/hm2),持水能力最强(15.39 t/hm2),但持水率不如木荷纯林(246.69%)。(2)马尾松纯林的枯落物层有效拦蓄量和最大拦蓄量均为最大(7.75,10.02 t/hm2),木荷纯林的最小(3.83,5.36 t/hm2)。(3)3种恢复模式的枯落物层持水量随浸水时间的变化均遵循对数函数Q=aln(t)+bR2>0.90,枯落物持水速率随浸水时间变化均符合幂函数:V=atbR2>0.95,拟合效果均较好。(4)马尾松间伐补木荷林、马尾松纯林、木荷纯林0—20 cm土层的水分最大滞留量分别为10.49,9.83,8.28 mm;木荷纯林土壤最大吸持贮水量(38.39 mm)高于马尾松间伐补木荷林(31.13 mm)和马尾松纯林(30.35 mm)。从枯落物最大持水量、有效拦蓄量及土壤毛管孔隙度、非毛管孔隙度多个因素的计算综合推断可知,3种恢复模式中马尾松纯林的枯落物和土壤表层的水源涵养能力最佳,马尾松间伐补木荷林次之,木荷纯林第三。在水土流失较为严重的退化红壤区,种植合适密度的马尾松林,可以通过地表枯落物层有效减缓水土流失。

    Abstract:

    In order to explore the impact of vegetation restoration on the water conservation function of litter layer and soil layer in degraded red soil region,and further reveal the functional effects of vegetation restoration in degraded ecosystems,water holding capacity of the litter layer and the 0—20 cm soil layer of three recovery modes (Schima superba Gardn. et Champ. pure forest,Pinus massoniana Lamb. pure forest,Pinus massoniana Lamb. replanted with Schima superba Gardn. et Champ) were measured by indoor flooding and cutting ring methods. The results showed that: (1) Pure Pinus massoniana. forest had the maximum litter accumulation (7.91 t/hm2) and water holding capacity (15.39 t/hm2),but lower maximum water holding rate than that of Schima superba. pure forest (246.69%).(2) The effective and the maximum storage capacity of litter layer in pure Pinus massoniana forest was the largest (7.75,and 10.02 t/hm2,respectively),while the smallest (3.83,5.36 t/hm2,respectively) was found in Schima superba pure forest. (3) The relationship between water holding capacity of litter layer and the immersion time followed the logarithmic function Q=aln(t)+b,R2>0.90; while the change of water holding rate of litter with the time of immersion fit the power function: V=atb,R2>0.95,and the fitting is better. (4) The averaged maximum water retention of 0—20 cm soil layer in Pinus massonian are planted with Schima superba,Pinus massoniana pure forest and Schima superba pure forest were 10.49 mm,9.83 mm,and 8.28 mm,respectively. The mean value of soil maximum water absorption and storage capacity was higher in Schima superba (38.39 mm) than those in Pinus massoniana replanted with Schima superba (31.13 mm) and Pinus massoniana (30.35 mm). Therefore,it could be inferred that Pinus massoniana pure forest had the largest water conservation capacity,followed by Pinus massoniana replanted with Schima superb and then Schima superba pure forest. In the degraded red soil area where soil erosion is more serious,Pinus massoniana can provide a compromise solution for reducing soil erosion through the surface litter layer.

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温林生, 邓文平, 彭云, 白天军, 郑希玲, 丁翊东, 刘苑秋.江西退化红壤区3种森林恢复模式的枯落物和土壤表层水文功能研究[J].水土保持学报,2020,34(4):158~163

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  • 收稿日期:2019-12-29
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  • 在线发布日期: 2020-08-04
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