Impacts of litter and understory removal on soil properties in a subtropical Acacia mangium plantation in China
Impacts of litter and understory removal on soil properties in a subtropical Acacia mangium plantation in China
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中国亚热带马占相思人工林凋落物和林下植被清除对土壤性质的影响
DOI：
10.1007/s11104-007-9536-6
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发表时间：
2008-01
期刊：
影响因子：
4.9
通讯作者：
Xia, Hanping
中科院分区：
文献类型：
--
作者：
Cai, Xi'an;Xiong, Yanmei;Li, Zhi'an;Fu, Shenglei;Xia, Hanping
在森林生态系统中，凋落物或林下植被对土壤性质的影响远未被完全了解。我们在纯马占相思上进行了一项研究。通过去除凋落物或林下植物或两者兼有的方法，在中国南部的人工林地上进行试验，然后将这些处理与对照(未干扰)进行比较，以评估它们对土壤物理、化学和生物性质的影响。此外，还进行了枯枝落叶分解实验，以了解林下植被对枯枝落叶分解的影响。我们的数据表明，林下植被的存在在很大程度上有利于凋落物的分解。在1年中，对照和林下清除处理分别有75.2%和37.2%的枯枝落叶分解。凋落物对保持土壤水分和提高土壤肥力具有重要意义，包括有机质(OM)、速效磷(P)和碱解氮(N)，但林下植被对土壤理化性质的影响小于凋落物。微生物量碳(MBC)表明，枯枝落叶层和林下植被对土壤生物活性有重要影响，而去除其中一种或两者去除后，对土壤交换性钾(K)的影响不显著。与我们的假设相反，清除林下或凋落物的影响并不总是负面的。随着凋落物的清除，土壤pH显著增加，这是研究地点酸性土壤的一个积极因素。除土壤水分外，除枯枝落叶和林下植被清除对土壤化学性质有显著影响外，仅在表层10~20 cm土层观察到显著影响。土壤速效P和速效钾含量雨季显著高于旱季，其他土壤性质受季节影响不大。
In forest ecosystems, the effects of litter or understory on soil properties are far from being fully understood. We conducted a study in a pure Acacia mangium Willd. plantation in southern China, by removing litter or understory or both components and then comparing these treatments with a control (undisturbed), to evaluate their respective effects on soil physical, chemical and biological properties. In addition, a litter decomposition experiment was conducted to understand the effects of understory on litter decomposition. Our data showed that the presence of understory favored litter decomposition to a large extent. In 1 year, 75.2 and 37.2% of litter were decomposed in the control and understory removal treatment (UR), respectively. Litter had a profound significance in retaining soil water and contributing to soil fertility, including organic matter (OM), available phosphorus (P) and alkali-hydrolyzable nitrogen (N), but understory exerted less influence than litter on soil physical and chemical properties. Both litter and understory played an important role in soil biological activity as indicated by microbial biomass carbon (MBC), while there were no significant impacts on soil exchangeable potassium (K) after either or both were removed. Contrary to our hypothesis, the effects of understory or litter removal were not always negative. A significant soil pH increase with litter removal was a positive factor for acid soil in the studied site. Except for soil moisture, significant effects, caused by removal of litter or/and understory, on measured soil chemical characteristics were only observed in the top 10 cm soil layer, but not in the 10–20 cm layer. Soil available P and exchangeable K contents were significantly higher in the rainy season than in the dry season, however, for the other soil properties, not substantially affected by season.
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影响因子：
16.8
作者：
D. J. Lodge;William H. McDowell;C. P. McSwiney
通讯作者：
D. J. Lodge;William H. McDowell;C. P. McSwiney
影响因子：
4.9
作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1007/bf00031701
发表时间：
1992-09
期刊：
Vegetatio
影响因子：
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作者：
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通讯作者：
Alain Meilleur;André Bouchard;Yves Bergeron
影响因子：
3.7
作者：
Mo, Jiangming;Brown, Sandra;Kong, Guohui
通讯作者：
Kong, Guohui