| 摘要: |
| [目的]探讨不同水平外源性C(蔗糖)、N(硝酸铵)干扰对岷江上游典型林地土壤及其生活叶中C、N含量的影响,为人工纯林的合理经营提供科学的理论指导.[方法]以四川岷江流域上游连香树(Cercidiphyllum japonicum)、云南松(Pinus yunnanensis)、糙皮桦(MBetula platyphylla)和云杉(Picea asperata)4种林地为研究对象,对其进行不同水平的外源性C、N干扰(C源为蔗糖,水平分别为:C1.施蔗糖1500 kg/hm2,C2.施蔗糖2 000 kg/hm2;N源为硝酸铵,水平分别为:N1.施硝酸铵450 kg/hm2,N2.施硝酸铵750 kg/hm2),研究林地土壤及林木生活叶C、N含量的变化情况.[结果]外源性C、N干扰对不同林地土壤C、N含量的影响不同,连香树重度C干扰、云南松轻度C干扰、云杉轻度C干扰均能提高其林地土壤的C、N含量; C、N干扰后连香树、云南松和糙皮桦林地生活叶中有机C含量增加,且连香树林地N干扰效果优于C干扰.C干扰后云杉生活叶中C含量增加,而N干扰后其含量有所下降.N干扰能明显增加连香树生活叶的N含量,轻度C、N干扰可提高云杉叶的N含量,各干扰对云南松叶中N的影响不明显.[结论]连香树林地以C2和N2水平的干扰较好,云南松林地以C1水平干扰较好,云杉林地以C1和N1水平的干扰较好,糙皮桦林地不宜进行干扰. |
| 关键词: 森林土壤 生活叶 C、N含量 外源性C、N干扰 干扰强度 岷江上游 |
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| 基金项目:国家自然科学基金项目（30471376）；中国科学院成都生物研究所开放实验室基金项目 |
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| Effects of external source C,N disturbances on C,N content in forests'' soil and living leaves in typical forest ecosystem |
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| Abstract: |
| 【Objective】 The purpose of this study was to probe into the effects of external source C (cane sugar) and source N (NH4NO3) on forests’soil and living leaves,in order to provide theoretical direction for forest ecosystem management.【Method】 Different levels of external C,N disturbance with C source (cane sugar:C1.1 500 kg/hm2,C2.2 000 kg/hm2)and N source (NH4NO3:N1.450 kg/hm2,N2.750 kg/hm2) were used to 4 kinds of typical forests （Cercidiphyllum japonicum,Pinus yunnanensis,Betula platyphylla，Picea asperata）in Minjiang areas.【Result】 C and N disturbing effects on C,N contents in forest soil were different: heavy disturbances for Cercidiphyllum japonicum,light disturbances for Pinus yunnanensis and light disturbances for Picea asperata could increase their C and N contents；C and N disturbances could increase the C content in the living leaves of Cercidiphyllum japonicum，Pinus yunnanensis and Betula platyphylla,and the C content increased with the increase of the C and N disturbances of the fomer two forests.C disturbances could increase the C content in the living leaves of Picea asperata,but N disturbances could decrease the C content. N disturbances could increase the N content in the living leaves of Cercidiphyllum japonicum obviously,light C and N disturbances could increase N content in Picea asperata living leaves,disturbances were not significant for N content in the living leaves of Pinus yunnanensis.【Conclusion】 It suggests that:C2 and N2 level disturbances have better impact on C.japonicum;C1 level disturbances have better impact on Pinus yunnanensis;C1 and N1 level disturbances have better impact on Picea asperata;disturbances for Betula platyphylla is not suitable. |
| Key words: forest soil living leaf C,N content disturbance of external source C,N disturbing intensity upper reaches of Minjiang River |
