| 摘要: |
| 【目的】揭示子午岭林区不同发育阶段油松人工林土壤理化性质的变化规律，为该地区油松人工林的地力维护提供理论依据。【方法】采用典型样地调查方法，在甘肃省正宁县中湾林场，以荒坡为对照，测定不同发育阶段(幼龄林、中龄林、近熟林、成熟林)油松人工林土壤的物理性质和主要养分含量，并对各指标进行相关性分析。【结果】在油松人工林不同发育阶段，土壤含水量变化不明显；成熟林阶段土壤体积质量和孔隙度明显优于荒坡和其余各发育阶段林地；随林龄的增长，土壤有机质、全氮含量呈上升趋势，土壤pH逐渐下降，速效磷、速效钾、硝态氮、铵态氮呈波动变化；相关性分析发现，土壤有机质、全氮和pH之间均存在相关性，其中有机质与全氮极显著正相关，pH与有机质、全氮显著负相关。【结论】从土壤持续发育的过程来看，在黄土高原子午岭林区营造油松人工林可以使林地土壤的理化性质得到持续改善，土壤养分进一步增加。 |
| 关键词: 油松 人工林 土壤性质 黄土高原 子午岭 |
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| 基金项目:国家“十二五”科技支撑计划项目“黄土高原人工林可持续经营技术研究与示范”(2012BAD22B0302) |
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| Changes of soil physical-chemical properties of Pinus tabuliformis plantations at different developmental stages in Ziwuling region of Loess Plateau |
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DANG Peng,WANG Nai-jiang,WANG Juan-ting,et al
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| Abstract: |
| 【Objective】This study illustrated the variations of soil properties of Pinus tabuliformis plantations at different developmental stages in Ziwuling region of Loess Plateau,aiming to improve soil maintenance in this region.【Method】The experiment was conducted in Zhongwan forest farm in Zhengning,Gansu using typical sample plots survey method.Slope wasteland was taken as control.The physical and chemical properties and contents of nutrients of the soil of Pinus tabuliformis plantations at different developmental stages (young forest,immature timber,nearly mature forest,and mature forest) were measured,and correlation analysis among all indicators was conducted.【Result】At different developmental stages of Pinus tabuliformis plantations,the change of soil moisture content was not significant.Soil bulk density and porosity of mature forest were better than those of other stages and the control.With the increase of the forest age,contents of soil organic matter and total nitrogen increased,while soil pH decreased,and contents of available P,available K,nitrate and ammonium fluctuated.Correlation analysis showed that organic matter,total nitrogen and soil pH correlated with each other,with an extremely significant positive correlation between organic matter and total nitrogen,and a significant negative correlation between soil pH and total nitrogen or organic matter.【Conclusion】From the perspective of the soil sustainable development process,creating Pinus tabuliformis plantations in Ziwuling region of Loess Plateau could sustainably improve the soil physical-chemical properties and soil nutrients. |
| Key words: Pinus tabuliformis plantation soil physical-chemical properties Loess Plateau Ziwuling |
