陕西省3种主要树种叶片、凋落物和土壤N、P化学计量特征

发布时间：2018-02-22 09:43

本文关键词： 刺槐辽东栎油松土壤化学计量特征地理因子气候因子　出处：《生态学报》2017年02期 　论文类型：期刊论文

【摘要】：以陕西省29个县(市)39个样点的刺槐、辽东栎和油松林为研究对象,分析比较不同树种乔木叶片、凋落物与土壤N、P化学计量特征及其与经纬度、海拔、年均温度和年降水等环境因子间关系的异同以及三者之间可能存在的关系,以期为认识陕西省主要森林树种养分限制状况、制定合理的植被管理和恢复措施提供理论依据。结果表明:3树种叶片N、P含量及比值均为刺槐辽东栎油松,与叶片相比,凋落物中N、P含量变化幅度较小,为刺槐辽东栎油松,N∶P比值为油松辽东栎刺槐。10—20 cm与0—10 cm土层相比,3树种中除辽东栎中P含量差异不显著外,其它指标N、P含量及N∶P比值均显著下降(P0.05)。刺槐、辽东栎和油松叶片N、P含量与土壤N、P含量均没有显著相关性,以刺槐、辽东栎和油松3种植物叶片为总体来说,P含量与土壤P含量显著正相关(P0.05)。叶片N、P含量均大致表现出随着年均温度和年降水的增加而增加,随着经纬度的增加而降低的趋势,这一点在刺槐叶中最为明显。凋落物N含量随着年均温度和年降水的增加而增加,随着纬度和经度的增加而降低;P含量随着年降水和经度的增加而降低;N∶P比值随着年均温度和年降水的增加而增加,随着纬度的增加而降低。研究区内,土壤N、P含量随着纬度、海拔的增加和年均温度、年降水、经度的降低而增加,N∶P比值则呈相反的趋势。3树种土壤N、P含量及N∶P比值中,P含量比N含量受环境影响更大,且0—10 cm和10—20 cm土层N、P含量及N∶P比值与各环境因子的关系基本一致。
[Abstract]:The tree leaves, litter and soil of tree leaves, litter and soil in 39 samples of Robinia pseudoacacia, Quercus liaotungensis and Pinus tabulaeformis were studied in 29 counties (cities) of Shaanxi Province. The similarities and differences between environmental factors such as average annual temperature and annual precipitation, and the possible relationships among them, in order to understand the nutrient limitation of the main forest tree species in Shaanxi Province, Reasonable vegetation management and restoration measures were made to provide the theoretical basis. The results showed that the content and ratio of N ~ + P in leaves of three species were all Pinus tabulaeformis L., and the change range of N ~ (+) P content in litter was smaller than that in leaves of Pinus pseudoacacia var. liaotungensis. The results showed that the ratio of N to P of Pinus tabulaeformis was the same as that of Pinus tabulaeformis L. in the soil layer of 10 ~ (-20) cm and 0 ~ 10 cm, except for the difference of P content in Quercus liaotungensis, the other indexes, the content of N ~ (+) P and the ratio of N _ (1) to P, decreased significantly (P _ (0.05)). There was no significant correlation between the content of N P in leaves of Quercus liaotungensis and Pinus tabulaeformis and the content of N P in soil, especially Robinia pseudoacacia. The leaves of Quercus liaotungensis and Pinus tabulaeformis were significantly positively correlated with soil P content (P 0.05). The leaf Nu P content generally increased with the increase of average annual temperature and annual precipitation, and decreased with the increase of longitude and latitude. This was most obvious in the leaves of Robinia pseudoacacia. The N content of litter increased with the increase of annual temperature and annual precipitation. With the increase of latitude and longitude, the content of N + P decreases with the increase of annual precipitation and longitude, and the ratio of N: P increases with the increase of annual temperature and annual precipitation, and decreases with the increase of latitude. The increase of elevation, annual temperature, annual precipitation, longitude and the increase of N / P ratio showed the opposite trend. 3 the content of N ~ (+) P in soil of tree species and the ratio of N to P were more affected by the environment than the content of N. The relationship between the content of N ~ (+) P and the ratio of N _ (1) to P in 0-10 cm and 10 ~ (-20) cm soil layers was basically consistent with the environmental factors.
【作者单位】：西北农林科技大学林学院;西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院水利部水土保持研究所;
【基金】：国家自然科学基金资助项目(41201088,41371506) 中国科学院西部之光资助项目(K301021304);中国科学院陕西省森林固碳现状、速率和潜力研究(XDA05050203-05)
【分类号】：S718.4;S714

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