Nutrient Export with Logs, and Release from Residues, after Harvest of a Pinus taeda Plantation in Uruguay

A. D. Pino, Jorge Henández, Gimena Arrarte
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引用次数: 1

Abstract

In Uruguay, Pinus taeda is usually planted a few months after harvest of the former turn, therefore; decomposing residues represents a nutrient source for the new plantation. The aim of this study was to determine the biomass and nutrient extraction off site, following the harvest of a P. taeda plantation. Residue decomposition patterns, and nutrient release were also examined. The site will be referred as S1, corresponding to the clear cut of a 22-year-old P. taeda plantation. Before the clear cut 10 trees were harvested, and logs, branches, twigs, and needles separately weighed. Additionally, forest litter at harvest time was quantified in three different areas. To assess decomposition, mesh bags with residues were allocated in three areas over the forest litter, and samples were taken periodically for 26 months. The remaining biomass, N, P K, Ca, and Mg contents were determined in the different fractions, calculating decompositon rates. Most of the harvested biomass was removed in logs, but the proportion of nutrients exported was considerably lower. Needles showed the highest biomass loss and only 39.1% remained after 26 months, while branches presented high rates in the first two months after cut, but slower thereafter, and at the end of the study more than two thirds of the woody residues remained. Potassium was rapidly released from the residues, while Ca, and Mg, were slowly released, and there was evidence of N and P immobilization in the early stages of decomposition. It was concluded that, although a lower proportion of nutrients were exported, compared to biomass, in the long term, nutrient export with logs could be significant for the sustainability of this production system. While K release from residues did not depend on biomass decay, the slow decomposition, and release of the other nutrients, indicates that this process could have been delayed by nutrient scarcity.
乌拉圭一个红松种植园收获后原木的养分输出和残留物的释放
在乌拉圭,松木通常在前一季收获几个月后种植,因此;分解的残留物是新人工林的营养来源。本研究的目的是确定采收后紫檀人工林的生物量和养分提取。残留物分解模式和养分释放也进行了检测。该地点将被称为S1,对应于一个22年的紫杉树人工林的砍伐。在砍完10棵树之前,将原木、树枝、细枝和针叶分别称重。此外,对3个不同地区采伐期的森林凋落物进行了量化。为了评估分解情况,在森林凋落物的三个区域分配了装有残留物的网袋,并定期取样26个月。测定不同组分的剩余生物量、N、P、K、Ca、Mg含量,计算分解速率。大部分收获的生物量都在原木中被移走,但营养物质出口的比例相当低。针叶的生物量损失最大,26个月后仅剩下39.1%,而树枝在砍伐后的前两个月生物量损失较高,但此后下降,研究结束时超过三分之二的木本残留物仍然存在。钾快速释放,钙、镁缓慢释放,在分解初期有N、P固定的迹象。结论是,虽然与生物量相比,出口的营养物质比例较低,但从长远来看,用原木出口的营养物质对这种生产系统的可持续性可能具有重要意义。虽然残留物中钾的释放不依赖于生物量的腐烂,但缓慢的分解和其他营养物质的释放表明,这一过程可能因营养缺乏而延迟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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