黔中喀斯特地区典型次生林内凋落叶化学计量特征

发布时间：2018-02-09 16:48

本文关键词： 生态化学计量特征凋落叶次生林喀斯特黔中　出处：《河南科技大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：为了研究退化喀斯特森林养分循环特征,以黔中喀斯特常绿落叶阔叶次生林内的10个优势种凋落叶为对象,开展化学计量学特征研究。研究结果表明:凋落叶中C、N、P元素与凋落叶的质量比分别为(497.88±12.97)mg/g、(12.19±0.54)mg/g和(0.89±0.05)mg/g。m(C)∶m(N)、m(C)∶m(P)和m(N)∶m(P)值分别为43.17±2.07、620.03±42.33和14.60±0.81。不同生活型树种凋落叶中C和P元素与凋落叶的质量比及m(C)∶m(P)均表现为常绿树种大于落叶树种(P0.05)。凋落叶中N、P与凋落叶的质量比呈正相关。同其他研究结果相比,喀斯特地区树种凋落叶中C、N、P元素与凋落叶的质量比具有地域差异。黔中次生森林凋落叶中C、N、P与凋落叶的质量比普遍较高,凋落叶的分解速率较快,N、P元素成比例矿化释放,但是矿质养分和凋落叶的分解不受有机物与凋落叶质量比的影响。
[Abstract]:In order to study the nutrient cycling characteristics of degraded karst forest, 10 dominant species in karst evergreen deciduous broad-leaved secondary forest in central Guizhou were studied. The results of chemometrics study showed that the mass ratios of C ~ (+) N ~ (P) in litter leaves to those in leaves were 497.88 卤12.97 mg / g and 0.89 卤0.05 mg / mg / g, respectively. The values of C and P elements in leaves of different species were 43.17 卤2.07 ~ (620.03 卤42.33 卤42.33 卤14.60 卤0.81), and the values of C and P were 0.89 卤0.05 ~ (mg / g) and 0.89 卤0.05 mg 路mg / g ~ (-1), respectively (= 43.17 卤2.07 卤620.03 卤42.33 卤42.33 and 14.60 卤0.81respectively). Both the mass ratio and the mass ratio of the evergreen tree species were larger than those of the deciduous tree species P0.05. the ratio of N ~ + P in the leaves was positively correlated with the mass ratio of the leaves, and compared with the results of other studies, the ratio of N ~ + P in the leaves was positively correlated with the weight ratio of the leaves. The mass ratio of C ~ (+) N ~ (+) P in litter leaves of tree species in Karst area is different from that in leaves. The mass ratio of C ~ (+) N ~ (+) P in litter leaves of secondary forest in central Guizhou is generally higher than that in litter leaves, and the decomposition rate of litter leaves is faster than that of leaves. However, the decomposition of mineral nutrients and litter leaves was not affected by the ratio of organic matter to leaf mass.
【作者单位】：贵州大学生命科学学院;贵州省山地生态与农业生物工程协同创新中心;贵州省林业科学研究院;
【基金】：贵州省科技厅重大基础研究基金项目(黔科合JZ字[2014]2002) “十二五”农村领域国家科技计划课题研究子课题(2012BAD22B010402)
【分类号】：S714

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