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ROLE OF LIGHT, MOISTURE AND NUTRIENT AVAILABILITY IN REPLACEMENT OF QUERCUS LEUCOTRICHOPHORA BY PINUS ROXBURGHII IN CENTRAL HIMALAYA

Kiran Bargali
Journal of Tropical Forest Science
Vol. 10, No. 2 (December 1997), pp. 262-270
Stable URL: http://www.jstor.org/stable/43582123
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
ROLE OF LIGHT, MOISTURE AND NUTRIENT AVAILABILITY IN REPLACEMENT OF QUERCUS LEUCOTRICHOPHORA BY PINUS ROXBURGHII IN CENTRAL HIMALAYA
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Abstract

In large areas of Central Himalaya, Quercus leucotrichophora forests are being replaced by Pinus roxburghii To determine the role of light, moisture and nutrient availability in this replacement, seedlings of these two species were planted separately and in mixture and the performance of each in the presence of the other was examined. It was found that in all conditions, P. roxburghii had more dry mass yield over Q. leucotrichophora and this became more pronounced in higher resource availability. Competition effect and relative crowding coefficient also indicated that P. roxburghii is superior in obtaining resource. This competitive superiority of P. roxburghii also increased with increasing resource availability. Relative yield total also showed some niche differentiation between these two species. Continual man-made disturbances, which allow more light and nutrient availability, have enabled P. roxburghii to invade Q leucotrichophora forest and to establish stable stands. Di kawasan yang lúas di Himalaya Tengah, hutan Quercus leucotrichophora digantikan dengan hutan Pinus roxburghii Untuk menentukan peranan cahaya, kelembapan dan ketersediaan nutrien dalam penggantian ini, anak benih kedua-dua spesies ditanam berasingan dan secara campuran, dan prestasi setiap spesies dengan kehadiran spesies yang satu lagi juga dikaji. Dalam semua keadaan, P. roxburghii didapati mempunyai hasil jisim kering yang lebih banyak berbanding dengan Q Leucotrichophora dan ini menjadi semakin nyata dengan ketersediaan sumber yang lebih tinggi. Kesan persaingan dan koefisien kerumun relatif juga menunjukkan bahawa P. roxburghii terbaik untuk mendapatkan sumber. Saingan P. roxburghii yang terbaik juga bertambah dengan bertambahnya ketersediaan sumber. Jumlah hasil relatif juga menunjukkan beberapa perbezaan di an tara kedua-dua spesies ini. Gangguan manusia secara berterusan yang menyebabkan lebih banyak cahaya dan ketersediaan nutrien membolehkan P. roxburghii menceroboh hutan Q leucotrichophora dan untuk menubuhkan dirian yang stabil.

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