降水和林分密度对杉木人工林土壤－叶片碳氮磷质量分数的影响

为了更好地了解森林生态系统的养分状态及变化趋势从变化趋势看，杉木叶片养分与年均降水量无相关性，与林分密度密切相关。其 中，林分密度与叶片磷质量分数显著负相关( r = －0．354，P＜0．05) ，和叶片氮与磷质量分数比极显著正相关( r = 0．486，P＜0．001) 。研究发现，降水是驱动杉木人工林土壤氮动态过程差异的关键因子，林分密度是影响杉木人工林养分来源和输入量的主要指标。年均降水量和林分密度变化会对林地土壤养分的可利用性产生影响，最终影响杉木叶片养分质量分数。研究认为，叶片磷质量分数可以作为反映土壤氮和土壤磷等养分质量分数的指示器，降水可以作为土壤氮动态的预测指标。在高降水( 1500 mm 以上) 区域，将林分密度控制在 2 500 株·hm－2以下，有助于提高林地土壤和树木叶片养分质量分数，有利于杉木人工林生产力的维持与持续发展。

To better understand the nutrient status and changing trends of forest ecosystems, this study observed that the nutrient content in Chinese fir leaves has no correlation with mean annual precipitation, but is closely related to stand density. Specifically, stand density has a significantly negative correlation with leaf phosphorus mass fraction (r = -0.354, P < 0.05), and a highly significantly positive correlation with the ratio of leaf nitrogen mass fraction to phosphorus mass fraction (r = 0.486, P < 0.001). This study further found that precipitation is a key factor driving the differences in soil nitrogen dynamics of Chinese fir plantations, while stand density is the primary indicator affecting the nutrient source and input of these plantations. Changes in mean annual precipitation and stand density affect the availability of soil nutrients in forest stands, and ultimately alter the nutrient mass fraction in Chinese fir leaves. This study suggests that leaf phosphorus mass fraction can serve as an indicator of soil nutrient levels including soil nitrogen and phosphorus, while precipitation can act as a predictive indicator for soil nitrogen dynamics. In regions with mean annual precipitation ≥1500 mm, controlling stand density below 2500 trees·hm⁻² can help improve the nutrient mass fractions of forest soil and tree leaves, which is beneficial for maintaining the productivity and sustainable development of Chinese fir plantations.

搜集汇总

背景与挑战

背景概述

该数据集研究了降水和林分密度对杉木人工林土壤与叶片碳氮磷质量分数的影响。研究发现降水是土壤氮动态的关键驱动因子，而林分密度则显著影响叶片磷质量分数和氮磷比。基于此，研究建议在高降水区域将林分密度控制在特定阈值以下，以维持土壤和叶片养分水平及人工林生产力。