An ecological appraisal of Pinus roxburghii Sarg. (Chir pine) and Shorea robusta Gaertn. (Sal) plantations in Doon valley

S. Sivaranjani, V. Panwar
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Abstract

The present study focused on phyto-sociological and physico-chemical attributes of soil in Pinus roxburghii (Chir pine) and Shorea robusta (Sal) plantations in a reserved estate of New Forest, Dehradun. A total of 33 plant species comprising of 18 trees, 10 shrubs and five herbs were recorded from the study area. The tree density, in chir pine was lower 950 individuals/ ha as compared to 1073 individuals/ ha in sal vegetation. In saplings, high density was observed for Syzygium cumini (20 individuals/ 100m2) in sal followed by Broussonetia papyrifera (19 individuals/100m2) in chir pine plantation. Lantana camara, marked its presence with highest density (49 individuals/100 m2) in chir pine followed by Clerodendrum infortunatum (18 individuals/100 m2) in sal plantation. Higher tree basal cover (51 m2/ha) was recorded in sal than chir pine (19 m2/ha). Similarly, the tree diversity in sal was recorded higher (1.68) as compared to chir pine (1.51) plantation. Contrarily, sapling diversity was higher (2.81) in chir pine as compared to sal (2.52) plantation. Herbaceous flora was completely absent in sal plantation. Analysis of size class distribution revealed that sal trees (~ 29%) attained 21-30 cm diameter whereas chir pine trees (68%) were under 11-20 cm diameter class mainly due to preferred growing zone of the species and habitat suitability. The soil under chir pine was slightly acidic (5.98) with sandy loam texture. Soil was comparatively good with higher soil organic carbon (2.71%) under sal plantation mainly due to high humus deposition. It is suggested to restrict wide spread of Lantana camara in chir pine plantation for the better growth of the species and enhance nutrient availability.
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刺梨松的生态评价。(Chir pine)和Shorea robusta Gaertn。(萨尔)都恩山谷的种植园
本文研究了德拉敦新森林保护区红松林和赤松林土壤的植物社会学和物理化学特征。研究区共记录到33种植物,其中乔木18种,灌木10种,草本5种。赤松的树密度为950株/ ha,低于盐湖植被的1073株/ ha。幼树密度最高的是小松林的长尾松(Syzygium cumini)(20株/100m2),其次是油松林(Broussonetia papyrifera)(19株/100m2)。赤松林的大叶蛾密度最高(49株/100 m2),其次是小林的小叶蛾(18株/100 m2)。小松的树底盖度(51 m2/ha)高于赤松(19 m2/ha)。同样,小松人工林的树木多样性(1.68)高于赤松人工林(1.51)。相反,赤松人工林的树苗多样性(2.81)高于小松人工林(2.52)。盐碱地完全没有草本植物区系。大小级分布分析表明,小木松(~ 29%)的径级在21 ~ 30 cm,而赤松(68%)的径级在11 ~ 20 cm,这主要是由于物种的首选生长区和生境适宜性所致。赤松下土壤呈微酸性(5.98),质地为砂壤土。盐渍化人工林土壤相对较好,土壤有机碳含量较高(2.71%),主要是由于大量腐殖质沉积。建议限制大针叶大针叶在赤松人工林的广泛分布,以促进其生长,提高养分有效性。
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