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为揭示雷竹生理生态对林地覆盖经营的响应与适应机制,测定了不同覆盖经营年限(CK、1、3和6年)雷竹林1~3年生立竹叶片可溶性糖、淀粉、氮(N)和磷(P)含量,分析了覆盖经营对雷竹林叶片非结构性碳水化合物(NSC)与N、P含量及其化学计量关系的影响.结果表明:覆盖经营1年雷竹林叶片NSC及可溶性糖含量较CK显著升高,N/P显著降低,N限制作用增强;覆盖经营3年雷竹林叶片可溶性糖含量较CK显著降低,淀粉含量显著升高,而NSC含量变化不明显,单位质量N、P的NSC含量最高;覆盖经营6年雷竹林叶片NSC、可溶性糖含量较CK显著降低,淀粉含量和N/P显著升高,P限制作用增强.短期覆盖(≤3年)经营雷竹林叶片NSC含量与N、P含量呈显著正相关,与N/P呈显著负相关;长期覆盖(6年)经营雷竹林叶片淀粉含量与N、P含量呈显著负相关,与N/P呈显著正相关.研究表明,短期覆盖(≤3年)经营雷竹林叶片N/P的降低可促使叶片淀粉分解和可溶性糖积累,明显增强雷竹生长活性,而长期覆盖(6年)经营雷竹林叶片N/P升高则促进叶片淀粉积累,雷竹生长由N限制转变为P限制,立竹生长活性明显降低,引起雷竹林退化.因此建议雷竹林连续覆盖经营不宜超过3年.
In order to reveal the response and adaptation mechanism of Phyllostachys pubescens physiological ecology to forest cover management, the soluble sugar, starch, nitrogen (N) contents of Phyllostachys pubescens plantations were measured in different coverage years (CK, 1, 3 and 6 years) And phosphorus (P) in the leaves of Phragmites australis, and analyzed the effects of the management practices on the relationship between the content of non-structural carbohydrates (NSC) and the contents of N, P and their stoichiometry in Phyllostachys pubescens forest.The results showed that the content of NSC and soluble sugar Compared with CK, the content of soluble sugar in the leaves of Perennial Phyllostachys pubescens decreased significantly, the content of starch increased significantly, but the content of NSC did not change obviously, the N, P, P had the highest content of NSC. The content of soluble sugar in the leaves of Phragmites australis forest was significantly lower than that of CK, and the content of starch and N / P were significantly increased and the P-limiting effect was enhanced after covering for 6 years. Short-term coverage (≤ 3 years) There was a significant positive correlation between contents of N, P and contents of N and P, but negatively correlated with N / P. There was a significant negative correlation between starch content and N, P contents in leaves of Phragmites australis The research shows that short - term coverage (≤ 3 years) leaves N / P of Decrease could promote starch accumulation and soluble sugar accumulation in leaves, and significantly increase the growth activity of D. trifoliata. Long-term coverage (6 years) increased N / P in leaves of A. trifoliata to promote the accumulation of starch in leaves, and the growth of M. trifoliata changed from N to P , Standing bamboo growth activity was significantly reduced, causing degradation of the bamboo forest.Therefore, the proposed continuous management of the bamboo forest should not be more than 3 years.