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收获生物量后会导致土壤中植物养分的丧失。这种损失对于森林生产力的影响只有在已知原木、其它生物量和土壤中的植物养分总量的情况下才能确定。在热带雨林生态系统研究中,对于钙的全面分析通常只是针对原木和其它生物量,而对于土壤只测定交换性钙含量。本研究涉及到马来西亚沙巴(Snboh)贫钙基岩地区。结果表明,能够根据交换性钙的数量估算出土壤中总钙含量。在沙巴州,115个土壤剖面中19个的估算量低于我们在研究区域的测量值。测量区位于沙巴的Mendolong,在Mendolong,如果不对采伐引起的钙损失进行补偿,按照目前的轮作期就不可能有可持续发展的林业。
Harvesting biomass can lead to the loss of plant nutrients in the soil. The impact of such losses on forest productivity can only be determined if the total amount of plant nutrients in the logs, other biomass and soil is known. In tropical rain forest ecosystem studies, a comprehensive analysis of calcium is usually directed at logs and other biomass, whereas only the exchangeable calcium content is measured for the soil. This study deals with the area of calcium-depleted bedrock in Snboh, Malaysia. The results show that the total calcium content in soil can be estimated based on the amount of exchangeable calcium. In Sabah, 19 out of 115 soil profiles were estimated less than our measurements in the study area. The survey area is located in Mendolong, Sabah. In Mendolong, no sustainable forestry is possible at the current rotation if the loss of calcium from harvesting is not compensated.