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題名 | Soil Nutrient Status and Its Impact on the Growth of Three Rhododendron Species in a Temperate Forest of the Eastern Himalayas, India=印度東喜馬拉雅山溫帶森林土壤養分狀態和對三種杜鵑生長之影響 |
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作者 | Bharali, Sanjeeb; Paul, Ashish; Khan, Mohamed Latif; | 書刊名 | 臺灣林業科學 |
卷期 | 29:1 2014.03[民103.03] |
頁次 | 頁33-51 |
分類號 | 436.193 |
關鍵詞 | 季節; 深度; 海拔; 生長; 變異; Season; Depth; Elevation; Growth; Variation; |
語文 | 英文(English) |
中文摘要 | 森林土壤在時間和空間尺度上並非呈靜止狀態。森林土壤對森林內植物生長和樹種分佈有決定性之影響。本研究探討東喜馬拉雅山溫帶森林土壤物理和化學性質在空間和時間上之變異和對杜鵑生長之影響。依海拔高選擇三處不同土壤深度之試驗地,進行兩年期土壤季節性變化之分析和對三種杜鵑(Rhododendron kendrickii、Rhododendron grande和Rhododendron mechukae)生長之影響。兩年內每4個月進行樹高和胸高直徑之量測。相關分析顯示土壤物理和化學性質和土壤深度與海拔高均呈高度相關。Rhododendron kendrickii和Rhododendron grande高生長和土壤pH呈正相關而Rhododendron mechukae高生長與土壤pH呈負相關。另一方面,3種杜鵑之直徑生長均顯示與土壤pH呈正相關。此外,3種杜鵑之高生長和直徑生長,均顯示與土壤濕度、土壤有機碳和總氮量呈負相關,但均顯示與磷和交換性鉀呈正相關。土壤養分季節性之變異在不同海拔處有不同之變化。海拔較高之處土壤較酸,累積之有機物質會影響植物生長所需之各種養分,所選之3種杜鵑生長均受到不同地區所含土壤養分之影響。 |
英文摘要 | Soils within forests not static but rather are dynamic in space and time, and they play key roles in plant growth and species' distributions within the forest. The present study examined variations in soil physicochemical properties in space and time and their impacts on the growth of 3 Rhododendron species in a temperate forest of the eastern Himalayas. Soil samples collected from different soil depths were analyzed on a seasonal basis for 2 consecutive years from 3 different study sites along an elevational gradient. To study the impacts of soil properties on growth, 3 Rhododendron species were selected: R. kendrickii, R. grande, and R. mechukae. The growth of these 3 species was studied through random tagging at each study site. Seasonal growth in height and collar diameter was recorded at 4-mo intervals for a period of 2 yr. Correlation analyses were conducted to understand the impacts of soil parameters on rhododendron growth. Soil physicochemical properties showed significant variations with depth, season, and elevation. The growth in height of R. kendrickii and R. grande showed positive correlations with pH, while that of R. mechukae exhibited a negative correlation. On the other hand, pH exhibited positive correlations with growth in collar diameter for all selected rhododendrons. Moreover, growth in height and collar diameter of all selected rhododendrons showed negative correlations with the soil moisture content, organic carbon, and total nitrogen. Available phosphorus and exchangeable potassium exhibited positive correlations with growth of both height and collar diameter of all selected Rhododendron species. There was seasonal variability in nutrient availability at different elevations. The soil was more acidic at higher elevations, and organic matter accumulation affected the availability of various nutrients required by the plants. Further, the growth of the selected Rhododendron species was affected by the nutrient availability at different study sites. |
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