弄岗北热带喀斯特季节性雨林15 hm2样地木本植物萌生特征

摘要： 萌生更新是种子植物更新策略的重要组成部分，对于维持森林群落的稳定性起着重要的作用。本研究以弄岗北热带喀斯特季节性雨林15 hm2动态监测样地第1次普查数据中萌枝(根萌和枝萌)数据为研究对象，采用Torus-translation检验法分析了萌生能力在不同生境类型中的差异性，及其与不同环境因子的关联性。结果表明：样地中有190个物种具有萌生现象，平均每公顷1831株萌生个体；不同生境类型间萌生能力差异明显，总体表现为山顶周围萌生能力较强，山坡周围萌生能力较弱，此外萌生能力的生境关联性还与萌枝的径级大小有关；萌生能力与海拔、凹凸度、坡度和坡向的余弦值呈显著正相关，而与个体胸高断面积之和呈显著负相关。喀斯特季节性雨林中萌生更新较为普遍，其分布格局与环境因子间存在一定关联。为了深入揭示萌生更新格局形成的潜在生态学过程和维持机制，长期动态监测尤为必要。

关键词: 土壤氮库, 生物固氮, 少花蒺藜草, 植物氮库

Abstract:

Sprouting is a significant part in natural regeneration strategy, playing an important role in sustaining forest community stability. By using Torustranslation tests, we examined sprouting characteristics of woody plants in a fully mapped 15hm2 plot in a northern tropical karst seasonal rain forest in Nonggang, Guangxi, southern China, analyzed the differences of sprouting ability among three habitat types (gully, hillside and ridge), and tested the relationship between sprouting ability and environmental factors. A total of 190 species showed sprouting ability, with 1831 individuals per hectare. The sprouting ability significantly differed among the three habitat types, being stronger in ridges but lower in hillsides. In addition, the habitat-associated sprouting ability was correlated to DBH (diameter at breast height) class of sprouts. Spearman’s correlation analyses with Torus-translation tests showed that the sprouting ability was significantly positively correlated with elevation, convex, slope, and cosine values of aspect, while significantly negatively correlated with the total cross-sectional area at breast height of all individuals in each quadrat. Our results revealed that sprouting regeneration was common in this karst seasonal rain forest, and there might be an association between the sprouting distribution pattern and environmental factors. However, long-term dynamic monitoring data would be necessary to reveal the underlying ecological processes and mechanisms of this sprouting pattern.

Key words: biological nitrogen fixation, soil nitrogen pool, plant nitrogen pool, Cenchrus spinifex

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