Haruna Ahmed Osumanu, Aainaa Hasbullah Nur, Ab Majid Nik Muhamad
Department of Crop Science, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia, Bintulu Sarawak Campus, Bintulu, Sarawak, Malaysia.
ScientificWorldJournal. 2010 Oct 12;10:1988-95. doi: 10.1100/tsw.2010.196.
The world's tropical rainforests are decreasing at an alarming rate as they are converted to agricultural land, pasture, and plantations. Decreasing tropical forests affect global warming. As a result, afforestation progams have been suggested to mitigate this problem. The objective of this study was to determine the carbon and phosphorus accumulation of a rehabilitated forest of different ages. The size of the study area was 47.5 ha. Soil samples were collected from the 0-, 6-, 12-, and 17-year-old rehabilitated forest. Twenty samples were taken randomly with a soil auger at depths of 0-20 and 20-40 cm. The procedures outlined in the Materials and Methods section were used to analyze the soil samples for pH, total C, organic matter, total P, C/P ratio, yield of humic acid (HA), and cation exchange capacity (CEC). The soil pH decreased significantly with increasing age of forest rehabilitation regardless of depth. Age did not affect CEC of the rehabilitated forest. Soil organic matter (SOM), total C, and total P contents increased with age. However, C/P ratio decreased with time at 0-20 cm. Accumulation of HA with time and soil depth was not consistent. The rehabilitated forest has shown signs of being a C and P sink.
随着热带雨林被转变为农业用地、牧场和种植园，世界热带雨林正以惊人的速度减少。热带雨林的减少影响全球变暖。因此，有人建议开展造林计划来缓解这一问题。本研究的目的是确定不同树龄的恢复森林的碳和磷积累情况。研究区域面积为47.5公顷。从树龄为0年、6年、12年和17年的恢复森林中采集土壤样本。使用土壤钻在0至20厘米和20至40厘米深度随机采集20个样本。采用材料与方法部分概述的程序对土壤样本进行pH值、总碳、有机质、总磷、碳/磷比、腐殖酸（HA）产量和阳离子交换容量（CEC）分析。无论深度如何，土壤pH值都随着森林恢复树龄的增加而显著降低。树龄对恢复森林的CEC没有影响。土壤有机质（SOM）、总碳和总磷含量随树龄增加而增加。然而，在0至20厘米深度处，碳/磷比随时间下降。HA随时间和土壤深度的积累并不一致。恢复森林已显示出成为碳和磷汇的迹象。
