为了解山核桃果实膨大期林地土壤和叶养分生态化学计量学变异特征和养分重吸收特点，通过对4个样地的土壤、叶进行分析，结果表明：各样地土壤 C 质量分数差异显著，随着时间的变化，C 质量分数呈下降趋势，月份间 C 质量分数变化差异明显。各样地土壤 N 质量分数呈现“倒金字塔”型变化趋势。土壤 P 质量分数在顺溪样地呈显著下降，其余3个样地 P 变化表现“倒金字塔”型。直源和横路土壤 C、N 比和 C、P 比一直呈下降趋势。顺溪和板桥土壤 C、N 比则呈现“金字塔”变化趋势。直源和板桥土壤 N、P 比呈现上升趋势，而横路土壤 N、P 比则表现较为平缓下降。各样地山核桃功能叶片 N 质量分数随时间变化呈显著下降。叶片 P、K 质量分数在凋落物中明显低于绿叶期。叶片 N、P 比除板桥样地呈“金字塔”型变化趋势之外，其余3样地叶片 N、P 比随时间变化显著下降。对各样地土壤与叶片 N、P、K 相关分析发现，叶片与土壤 N 质量分数间显著正相关，两者间表现投入与吸收的等速比例关系，而土壤和叶片 P、K 间表现非等速关系，N、P 比在土壤投入和叶片吸收间表现等速关系，说明山核桃叶片功能建成过程中对 N、P 需求的按比例投入的依赖。 N、P 养分重吸收在各样地差别显著。
Leaves Nutrient Resorption Characteristics and Stoichiometry of C, N, P and K in Carya cathayensis and Soil
An experiment was conducted to examine the characteristics of nutrient resorption and stoichiometry of C, N, P and K in Carya cathayensis and soil of four sample plots.C content in soil is significantly different, and the C content decreases significantly in each sample in different months.The N and P contents trend to inverted pyramid, but P content decreases significantly in Shunxi sample plot.The C、N and C、P ratios decrease significantly in the soil of Zhiyuan and Banqiao sam-ple plots, but the C、N ratios trend to inverted pyramid in Shunxi and Banqiao sample plots.The N、P ratio in Zhiyuan and Banqiao increases significantly, but gently decreases in Henglu plot.The N content in leaves decreases significantly with season forward.The P and K contents in green leaves are significantly fewer than those in litter leaves.The N、P ratios in the leaves of Shunxi, Zhiyuan and Henglu sample plots decrease significantly with the season forward, but trend to inverted pyramid in Banqiao plot.The correlation analysis of N, P and K contents between all soil and leaves sample plots shows the positive correlation with the constant speed relations of N input and absorption.However, P and K contents show un-constant speed.Therefore, the leaves development depends on input proportion of N and P contents.The N and P resorp-tion contents are significantly different among all four sample plots.
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