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倒木是森林生态系统的重要组成部分,在地力维护、生物多样性保持以及碳(C)和养分循环等方面具有重要意义,但倒木物理化学性质随其腐烂等级和径级而变化。为了深入理解腐烂等级和径级对倒木物理化学性质的影响,该研究以典型阔叶红松林的建群种——红松(Pinus koraiensis)的倒木为研究对象,将其每个腐烂等级(I–V)下的倒木分为4个径级(径级i≤10.0 cm、径级ii 10.1–30.0 cm、径级iii 30.1–50.0 cm、径级iv>50.0 cm),研究了不同腐烂等级、径级及两者交互作用对倒木心材和边材物理化学性质的影响。结果表明:心材和边材具有相似的变化规律。倒木心材和边材含水率随着腐烂等级增加而增加,而木材密度随腐烂等级和径级的增加均呈下降趋势;边材C含量以及心材和边材的氮(N)、磷(P)含量随腐烂等级增加呈上升趋势,心材N、P含量随径级增加呈先增加后减少的趋势;纤维素含量随腐烂等级增加呈下降趋势,而木质素含量呈上升趋势,纤维素和木质素含量随径级增加没有明显变化规律。倒木含水率与C、N、P、木质素含量(除心材P含量)显著正相关,与纤维素含量显著负相关;木材密度与C、N、P、木质素含量显著负相关,与纤维素含量显著正相关。由此可见,倒木物理化学性质受不同腐烂等级和径级的影响有各自的变化规律,且倒木的物理性质(含水率和木材密度)是影响化学含量变化的重要因素。
Inverted wood is an important part of forest ecosystem. It has great significance in the conservation of soil and water, conservation of biological diversity and carbon (C) and nutrient cycling. However, the physical and chemical properties of fallen wood vary with its decay grade and diameter. In order to further understand the effect of decay grade and diameter on the physicochemical properties of fallen wood, this study studied the inverted wood of Pinus koraiensis, a typical species of broad-leaved Korean pine forest, -V) were divided into four diameter classes (diameter i≤10.0 cm, diameter ii 10.1-30.0 cm, diameter iii 30.1-50.0 cm, diameter iv> 50.0 cm), the different decay grades, Influence of the Interaction of Trapezoidal Size and Their Interaction on Physical and Chemical Properties of Heartwood and Scutellaria. The results show that the heartwood and sapwood have similar changing rules. The wood moisture content of sapwood and sapwood increased with the increase of decay grade, while the density of wood decreased with the increase of decay grade and diameter class. The content of C and the contents of nitrogen (N) and phosphorus (P) in sapwood and sapwood, The content of N and P in heartwood increased firstly and then decreased with the increase of diameter grade. The content of cellulose decreased with the increase of decay grade, while the content of lignin increased. The contents of cellulose and lignin There was no obvious change of content with the increase of diameter. There was a significant positive correlation between moisture content and C, N, P, lignin content (except for heartwood P) and negatively correlated with cellulose content. There was a significant negative correlation between wood density and C, N, P and lignin content, Significantly positive correlation. Thus, the physical and chemical properties of fallen wood under different decay grades and diameters have their own variation rules, and the physical properties of inverted wood (moisture content and wood density) is an important factor affecting the chemical content changes.