RSPO TIER 1 DRAINABILITY ASSESSMENT IN DEEP PEAT OF KINABATANGAN RIVER BASIN-A CASE STUDY

The Planter Pub Date : 2021-05-25 DOI:10.56333/tp.2021.008
J. Mathews, S. Mohanaraj, A. M. Sikab, Y. Z. Chia, T. Agus, O. Wanorhessam
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Abstract

A case study of peat drainability assessment based on the tier 1 method of roundtable on sustainable palm oil (RSPO) was conducted in three estates covering over 1 421 hectares of oil palm planted in contiguous deep peat. The objective of the study was to understand whether the land can be replanted with oil palm for future cultivation as per RSPO principle 7, criterion 7.7 and indicator 7.7.5. The factors surveyed and measured were the peat land area cultivated, its elevation, thickness, subsidence, determination of drainage base, daily measuring of mean water level at outlet to nearest waterbody, depth to the drainage base and finally the drainage limit time (DLT) for replanting and cultivation of oil palm. Based on the evaluation in 1 421 hectares, it was measured and observed that the depth to the drainage base was higher than the peat thickness in 526 hectares (37%). In such condition if organic matter is fully subsided, the land is suitable to be cultivated with oil palm on the underlying gleyic alluvium soil. In the rest of the fields of 895 hectares (63%) the peat thickness or depth was higher than the depth to the drainage base while the balance of 204 hectares of land have the DLT of less than 40 years (calculated at 5 cm default value of subsidence). The balance of 690 hectares with DLT more than 40 years can be replanted and cultivated with oil palm, provided that stringent water management programmes are implemented in place to reduce the subsidence of peat for prolonged cultivation. Keywords: Peat subsidence, peat drainage assessment, drainage limit time drainage base.
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京那巴丹干河流域深泥炭层Rspo一级疏水性评价——以实例为例
基于可持续棕榈油圆桌会议(RSPO)第一级方法的泥炭排水能力评估案例研究在三个覆盖超过1421公顷的连续深泥炭种植的油棕庄园进行。研究的目的是了解是否可以根据RSPO原则7,标准7.7和指标7.7.5重新种植油棕以备将来种植。调查和测量的因素是泥炭地的种植面积,其高程,厚度,沉降,排水基地的确定,每天测量出口到最近水体的平均水位,到排水基地的深度,最后是重新种植和种植油棕的排水极限时间(DLT)。在1 421公顷的评价基础上,实测观察到526公顷的底泥深度大于泥炭厚度(37%)。在这种条件下,如果有机质完全沉降,则适合在下伏的闪灰冲积土上种植油棕。其余895公顷(63%)土地的泥炭厚度或深度高于到排水基地的深度,其余204公顷土地的DLT小于40年(按5厘米默认沉降值计算)。剩余的690公顷土地使用DLT超过40年,可以重新种植和种植油棕,前提是实施严格的水资源管理计划,以减少泥炭因长期种植而下沉。关键词:泥炭沉降;泥炭排水评价;排水时限;
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