西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

郝建; 莫慧华; 黄弼昌; 周燕萍; 蔡道雄

西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

1.
中国林业科学研究院热带林业实验中心, 广西凭祥 532600
2.
广西友谊关森林生态系统定位观测研究站, 广西凭祥 532699
3.
天峨县林朵林场, 广西天峨 547300
基金项目:
广西科学研究与技术开发计划项目:广西速生、珍优树种选择与营林可持续发展的研究(桂科攻11217003).
中图分类号: S714

Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis

1.
Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China
2.
Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532699, Guangxi, China
3.
Linduo Forest Farm of Tian'e County, Tian'e 547300, Guangxi, China
CLC number: S714

摘要: [目的]探讨南亚热带西南桦和尾巨桉人工纯林的凋落叶分解动态及其与土壤化学性质之间的相关关系.[方法]采用原位分解袋法研究凋落叶的分解过程.[结果]表明:西南桦、尾巨桉人工林凋落叶分解系数分别为0.96 a-1和0.88 a-1.在为期12个月的分解试验中,2种凋落叶有机C含量在整个分解过程中呈逐渐下降趋势;全K含量和C/N比在分解前期迅速下降,之后趋于平缓;全N含量和全P含量在整个分解过程中呈逐渐上升趋势;2种凋落叶N/P比则呈先升高后下降的趋势.无论是分解前期还是分解后期,凋落叶质量损失与N含量均呈显著正相关(前期R=0.877;后期R=0.855),与C/N均呈显著负相关(前期R=-0.735;后期R=-0.697).与尾巨桉林地土壤性质相比,西南桦凋落叶分解提高了林地0~10、10~20 cm土壤的有机C、全N、全P、全K、N/P,对2030 cm土壤有机C、全K、pH值、C/N、N/P则未产生显著影响.相关分析表明:凋落叶初始有机C含量与土壤有机C、全N、全P、全K、N/P显著相关;凋落叶初始全N含量与土壤全N、pH值、C/N显著相关.[结论]凋落叶的养分含量与土壤养分的关系紧密;与尾巨桉相比,西南桦凋落叶的养分含量明显较高,分解速率更快,释放到土壤中的养分也更多.
- 西南桦
- / 尾巨桉
- / 凋落叶
- / 养分含量
- / 分解速率
- / 化学性质
- / 南亚热带
Abstract: [Objective]To study the decomposition dynamics of leaf litter and its relationship with soil chemical properties in two young plantation stands (monocultures of Betula alnoides and Eucalyptus urophylla × E. grandis) in subtropical China. [Method]The decomposition processes of leaf litter were measured using mesh nylon bag method. [Result]The decomposition coefficients of leaf litter of B. alnoides and E. urophylla × E. grandis were 0.96 a-1 and 0.88 a-1, respectively. During the 12-month decomposition, the organic carbon contents declined gradually in the two leaf litter. The total K and C/N ratio rapidly decrease at the early stage, and tended towards stability thereafter. The total N and total P in the two leaf litter increased gradually, whereas the N/P ratio increased at first and then decreased throughout the entire decomposition. In both early and late phase of decomposition, the dry mass loss of the leaf litter was correlated positively with the N contents (R=0.877 and 0.855, respectively), and a negative relation was observed with C/N ratio (R=-0.735 and-0.697, respectively). Compared with the E. urophylla × E. grandis stand, the B. alnoides had significantly higher contents of soil organic carbon (SOC), total N, total P, total K as well as higher N/P ratio in 0-10 and 10-20 cm soil depth. However, the litter decomposition had no significant effects on SOC, total K, pH, C/N ratio and N/P ratio in 20-30 cm soil depth. The correlation analysis revealed that the organic C of leaf litter was significantly related to SOC, total N, total P, total K and N/P ratio, whereas the total N of leaf litter was significantly related to soil total N, pH and C/N ratio. [Conclusion]The nutrient contents of leaf litter were found to be significantly correlated with the soil nutrient condition. Compared with the E. urophylla × E. grandis, the nutrient contents of leaf litter were significantly higher in B. alnoides, and subsequently, faster decomposition rate of leaf litter resulted in higher soil nutrient contents.
- Betula alnoides
- / Eucalyptus urophylla × E.grandis
- / leaf litter
- / decomposition rate
- / nutrient content
- / chemical properties
- / subtropical China

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西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis

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西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

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Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis

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西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis

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西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

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Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis

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