Variation in vegetation structure and soil properties related to land use history of old-growth and secondary tropical dry forests in northwestern Mexico
Variation in vegetation structure and soil properties related to land use history of old-growth and secondary tropical dry forests in northwestern Mexico
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DOI：
10.1016/j.foreco.2008.04.049
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发表时间：
2008-07-30
影响因子：
3.7
通讯作者：
Lindquist, Cynthia
中科院分区：
文献类型：
--
作者：
Carlos Alvarez-Yepiz, Juan;Martinez-Yrizar, Angelina;Lindquist, Cynthia
本研究的目的是比较墨西哥西北部地区代表三种牛放牧强度(轻、中、重放牧)的古老热带干林和偶尔放牧的20-30年生次生林的植被结构和土壤性质。在每种森林类型内，采用位于不同放牧范围(“Potreros”)的3个0.1公顷样地作为重复。所有木本植物(树干直径=2.0 cm，1.30m高，胸径)在每个样地中都被识别和测量。平均断面积和地上生物量(AGB)在中等放牧的老生长林中显着较高。以豆科树种为主的次生林物种密度明显较低。次生林恢复20-30年后AGB的积累量占老生林AGB的43%。土壤性质在不同森林类型之间存在差异，但并不遵循一致的规律：中等放牧的老生林土壤全N和有机质含量最高，阳离子交换量(CEC)在三种老生林类型中相似，但次生林显著低于低放牧的老生林。典型对应分析表明，CEC与研究区物种的实际分布高度相关，特别是与次生林的优势种--相思的相关性更强。在经历长期干扰的老生长森林中，持久物种的重新萌发能力可能有助于保持成熟森林的一些结构特征。热带次生林积累AGB似乎相对较快，反映了它们储存碳和提供其他生态系统服务的潜力；因此，它们需要紧急保护措施。(C)2008爱思唯尔B.V.保留所有权利。
The objective of this study was to compare the vegetation structure and soil properties among old-growth tropical dry forests representing three categories of grazing intensity by cattle (light, moderate and heavy grazing) and a category of 20-30-yr-old secondary forest experiencing occasional grazing in a locality in northwestern Mexico. Within each forest type, three 0.1 ha plots located in different grazing ranges ("potreros") were used as replicates. All woody plants (stem >= 2.0 cm diameter at 1.30 m height, DBH) were identified and measured in each plot. Mean basal area and above-ground biomass (AGB) were significantly higher in the moderately grazed old-growth forest. Species density was significantly lower in the secondary forest, where a leguminous tree species was dominant. Accumulation of AGB after 20-30 yr of secondary forest recovery accounted for 43% of the old-growth forest AGB. Soil properties varied among forest categories but did not follow a consistent pattern: mean total N and organic matter content were highest in the old-growth forest with moderate grazing; cation exchange capacity (CEC) was similar among the three old-growth forests categories, but it was significantly lower in the secondary forest compared to the old-growth forest with low grazing. Canonical Correspondence Analysis showed that CEC was highly correlated with the actual species distribution in the study area, especially with Acacia cochliacantha the dominant species of the secondary forest category. Resprouting capacity of the persisting species in the old-growth forests experiencing chronic disturbance could have contributed to the maintenance of some of the structural characteristics of a mature forest. Tropical secondary forests seem to accumulate AGB relatively fast, reflecting their potential for carbon storage and provision for other ecosystem services; therefore, they deserve urgent protection measures. (C) 2008 Elsevier B.V. All rights reserved.