塔里木河胡杨林生长过程土壤层碳氮磷化学计量变化特征及与其叶含量的相关性

doi:10.6048/j.issn.1001-4330.2019.10.013

摘要/Abstract

摘要： 【目的】研究天然胡杨林生长过程中不同层次土壤C、N、P化学计量变化特征及与叶片C、N、P含量的相关性,为胡杨林经营管理提供理论依据。【方法】在新疆轮台县轮南镇选取5种不同林龄胡杨林(幼龄林、中龄林、近熟林、成熟林和过熟林)作为研究对象,测定和分析不同林龄胡杨林下土壤( 0～10、10～20、20～40、40～60、60～100 cm)和叶片的C、N、P含量及化学计量特征。【结果】(1)胡杨林土壤C含量在0～100 cm层次垂直分布差异不显著,这与其他森林群落有显著的不同。土壤N含量均呈现随土壤深度增加而减小的趋势,土壤N含量具有表层聚集的特征。土壤P含量在各层次分布较为均匀,在0～100 cm层次垂直分布差异不显著。(2)龄级对土壤化学计量有显著影响(P < 0.05),土层深度对土壤的C和P含量影响不显著,对土壤N含量和化学计量比影响差异显著,而龄级和土层深度的协同作用对土壤C和P含量的影响不显著,对土壤N含量和化学计量比影响显著。(3)叶N含量与土壤各层次的P含量呈显著正相关,叶P含量与土壤N含量呈现显著正相关,而叶N∶P与土壤C含量、N含量、C∶P、N∶P均呈现显著负相关。【结论】胡杨林土壤C含量垂直分布差异不显著,这与其他森林群落有显著的不同。土壤N含量具有表层聚集的特征。胡杨林生长过程对土壤N含量影响显著。土壤P含量在各层次分布较为均匀,但是,胡杨林生长过程对土壤P含量影响显著。近熟林和成熟林土壤的C∶N、C∶P和N∶P比在不同的土壤层次差异显著。

关键词: 胡杨; 化学计量; 林龄; 土壤层次

Abstract: 【Objective】 To study the C,N,P stoichiometric characteristics in different soil layers of different aged Populus euphratica forests and its relationship between soil and leaf for managing the forests scientifically. 【Method】 Five different aged Populus euphratica forests (young, middle aged, near-mature, mature and over-mature) in Lunnan Town, Luntai County, Xinjiang were selected as research subjects, the C, N, P contents in leaves and soils( 0-10,10-20,20-40,40-60,60-100 cm) of the forests were measured, and their stoichiometric characteristics were analyzed. 【Result】 The results showed that: (1). There was no significant difference in the vertical distribution of the soil C content, which was significantly different from those of other forest communities. Soil N content decreased with the increase of soil depth and had the characteristics of surface aggregation. Soil P content was evenly distributed in vertical soil layers, and was not significantly different in 0-100 cm soil profile. (2)The forest age-class had a significant influence on soil chemical metrology (P< 0.05). The effect of soil depth on soil C and P content was not significant, but on soil N content and the stoichiometric ratio were significant. The synergistic effects of the forest age with soil depth on soil C and P content were not significant, but the effects on soil N content and stoichiometric ratio were significant. (3) There was a significant positive correlation between leaf N content and soil P content, a significant positive correlation between leaf P content and soil N content, and a significant negative correlation between leaf N and soil C content, N content, C and P content. But the N∶P ratio in leaf showed significant negative relation with soil C, soil N, C∶P ratio and N∶P ratio in soil. 【Conclusion】 The difference of C content in soil vertical layers was not significant, which was distinctive from those in other forest communities. The N content gathered in the soil had the characteristics of surface aggregation and was severaly affected by the growth process. The P content was distributed evenly in soil layers and was affected by the forest age too. The C∶N, C∶P and N∶P ratios of soil in near-mature forest and mature forest were significantly different in different soil layers.

Key words: Populus euphratica; stoichiometry; forest age; soil layer

中图分类号:

:S71

史军辉, 刘茂秀, 王新英, 马学喜. 塔里木河胡杨林生长过程土壤层碳氮磷化学计量变化特征及与其叶含量的相关性[J]. 新疆农业科学, 2019, 56(10): 1879-1887.

SHI Jun-hui, LIU Mao-xiu, WANG Xin-ying, MA Xue-xi. The C, N, P Stoichiometric Characteristics in Soil Layers and Its Correlation with Those in Leaves in Different-aged Populus euphratica Forests along Tarim River[J]. Xinjiang Agricultural Sciences, 2019, 56(10): 1879-1887.

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