Studi Erosi Tanah Pada Areal Rumpang dan Hutan Alam Terdegradasi Di PT. Sarmiento Parakantja Timber

Abstract

Tebang pilih tanam rumpang (TPTR) dan tanam rumpang tebang rumpang (TRTR) merupakan inovasi sistem silvikultur yang meniru proses suksesi dan permudaan alam di hutan alam yang sedang terus dikembangkan. Tujuan dari penelitian ini untuk mengetahui pengaruh tanam rumpang terhadap laju erosi tanah pada areal penelitian tanam rumpang dan hutan alam terdegradasi di PT. Sarmiento Parakantja Timber. Metode yang digunakan dalam penelitian ini adalah metode tongkat erosi serta uji statistik berupa uji anova dan uji independent. Hasil penelitian menunjukkan pengikisan tanah tertinggi terjadi pada areal hutan alam terdegradasi, diikuti di areal simpukan, dan yang terendah di areal jalur tanam. Uji statistik menunjukkan bahwa erosi yang terjadi pada kondisi areal hutan alam terdegradasi, jalur simpukan dan jalur tanam berbeda nyata. Pengaruh kelas lereng datar-landai dan kelas lereng sedang terhadap besarnya erosi di areal rumpang juga berbeda nyata. Namun besarnya erosi yang terjadi di areal rumpang dan di areal hutan alam terdegradasi tidak berbeda nyata.

The silvicultural system of selective cutting and gap planting (TPTR) and the silvicultural system of gap planting and gap clear cutting (TRTR) are innovative silvicultural systems that mimic the process of succession and natural regeneration in natural forests, that are being developed. The purpose of this study was to determine the effect of gap planting on soil erosion rates in the research area of gap planting and natural forest of PT. Sarmiento Parakantja Timber. The method used in this research was the erosion stake method and statistical tests using anova tests and independent tests. The results showed that the highest soil erosion occurred in natural forest areas, followed by in the barrier areas, and the lowest in gap planting areas. Statistical tests showed that erosion that occurs in the condition of natural forest areas, gap planting areas, and barrier areas are significantly different. The effect of flat to sloping class and moderate slope class on the amount of erosion in the gap area was also significantly different. However, the amount of erosion that occurred in the gap planting area and in the degraded natural forest area was not significantly different.