| 邓厚银 1，2，晏 姝 2，王润辉 2，胡德活 2，郑会全 2，韦如萍 2，梁 机 1.粤北不同林龄杉木人工林下土壤层及枯落物层持水能力研究[J].广东农业科学,2019,46(2):51-58 |
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粤北不同林龄杉木人工林下土壤层及枯落物层持水能力研究 |
| Study on Water-holding Capacity of Soil Layer and Litter Layer of Chinese Fir Plantations with Different Stand Ages in Northern Guangdong |
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| DOI：10.16768/j.issn.1004-874X.2019.02.008 |
| 中文关键词: 杉木 林龄 土壤 枯落物 涵养水源 持水量 |
| 英文关键词: Chinese fir stand age soil litter water conservation water-holding capacity |
| 基金项目:广东省生态公益林效益补偿资金项目 |
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| 摘要点击次数: 2037 |
| 全文下载次数: 680 |
| 中文摘要: |
| 【目的】为了研究粤北地区不同林龄杉木人工林土壤层及枯落物层水源涵养能力情况，并对粤北
杉木人工林质量提升和生态改善提供依据。【方法】以广东韶关市 3 个林场中的杉木幼龄林（7~8 年）、中龄
林（16~18 年）、近熟林（23~25 年）为试验对象，采用环刀浸泡法和室内浸泡法对其林下土壤及枯落物持水
能力进行比较。【结果】0~30 cm 土层土壤容重大小表现为幼龄林（1.22 g/cm3）＞中龄林（1.17 g/cm3）＞近熟
林（1.14 g/cm3），毛管孔隙度大小表现为幼龄林（39.66%）＞中龄林（34.04%）＞近熟林（32.93%），土壤
有效持水量大小表现为幼龄林（650.70 t/hm2）＞近熟林（627.60 t/hm2）＞中龄林（619.78 t/hm2），但差异均不
显著。枯落物有效拦蓄量大小为中龄林（11.01 t/hm2）＞近熟林（10.95 t/hm2）＞幼龄林（4.04 t/hm2），且中龄
林显著高于幼龄林。回归分析表明枯落物在浸水 0.5 h 内吸水速率最大，其后迅速降低，至 12 h 时持水量达到
稳定；枯落物持水量与浸泡时间成对数关系（R2 ＞ 0.92），其吸水速率与浸泡时间成幂函数关系（R2 ＞ 0.97），
且吸水速率均表现为近熟林＞中龄林＞幼龄林。【结论】不同林龄杉木人工林土壤层持水能力表现为幼龄林＞
近熟林＞中龄林，枯落物层持水能力表现为近熟林＞中龄林＞幼龄林。 |
| 英文摘要: |
| 【Objective】To study the water-holding capacity of soil layer and litter layer of Chinese fir (Cunninghamia
lanceolata) plantations with different ages in northern Guangdong, and to provide basis for improving the quality and
ecology of Chinese fir Plantations in northern Guangdong.【Method】The young Chinese fir plantations (7-8 years),
middle-aged Chinese fir plantations (16-18 years) and near-mature Chinese fir plantations (23-25 years) in three forest
farms in Shaoguan City, Guangdong Province were used for study, and the ring knife soaking method and indoor soaking
method were applied in the comparative study of the water-holding capacity of soil layer and litter layer. 【Result】In soil layer of 0~30 cm, the soil bulk density of young Chinese fir plantations (1.22 g/cm3) was the highest, followed by middleaged Chinese fir plantations (1.17 g/cm3) and near-mature Chinese fir plantations (1.14 g/cm3); the capillary porosity of
young Chinese fir plantations was the largest (39.66%), followed by middle-aged Chinese fir plantations (34.04%) and nearmature Chinese fir plantations (32.93%); the effective water holding capacity of young Chinese fir plantations was the largest
(650.70 t/hm2), followed by near-mature Chinese fir plantations (627.60 t/hm2) and middle-aged Chinese fir plantations
(524.40 t/hm2), but the difference in the above the aspects was not significant. The effective litter storage capacity of middleaged Chinese fir plantations was the largest (11.01 t/hm2), followed by near-mature Chinese fir plantations (10.95 t/hm2) and
young Chinese fir plantations (4.04 t/hm2), and the capacity of middle-aged Chinese fir plantations was significantly higher
than that of the two. Regression analysis showed that the litter had the highest water absorption rate within 0.5 h after water
soaking, then the rate decreased rapidly, and the water-holding capacity became stable at 12 h after water soaking. The
water-holding capacity of litter was logarithmically related to the soaking time (R2 > 0.92), and the water absorption rate was
in a power function relationship with the soaking time (R2 > 0.97), and the water absorption rate of near-mature Chinese fir
plantations was the highest, followed by middle-aged Chinese fir plantations and young Chinese fir plantations. 【Conclusion】
The soil water-holding capacity of soil layer of Chinese fir plantations with different forest ages is as follows: young Chinese
fir plantations had the largest capacity, followed by near-mature Chinese fir plantations and middle-aged Chinese fir
plantations; as to the water-holding capacity of litter layer, the near-mature Chinese fir plantations had the largest, followed
by middle-aged Chinese fir plantations and young Chinese fir plantations. |
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