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1978年以来,湖南洞庭湖区大面积推广应用了I-72/58,I-69/55,I-63/51和I-214等几个新无性系杨树造林。为了探讨这几种杨树的速生丰产措施,我们于1982年3-5月,在汉寿县林科所试验林场和围堤湖农场下属的5个林场,对上述杨树4年生林分进行了调查研究。本文仅从杨树生长量与地下水位的关系加以浅析,试图为该地区更好地营造杨树丰产林提供一点参考资料。一、调查地概况上述调查地位于沅江下游洞庭湖西岸。土壤均为冲积砂壤土,质地轻粘到重壤。该地年
Since 1978, large poplar areas of Hunan Dongting Lake have popularized and popularized several new clones of poplar, such as I-72/58, I-69/55, I-63/51 and I-214. In order to explore the quick-growing and high-yielding measures for these poplar species, we conducted the above-mentioned 4-year-old poplar tree stands in 5 forest farms under the pilot forest farm and the levee farrow in Hanshou County from March to May, 1982 The investigation and study. This paper only analyzes the relationship between poplar growth and groundwater level, and attempts to provide some reference materials for better poplar poplar production in this region. I. Survey of the Survey The investigation was conducted in the west bank of Dongting Lake in the lower reaches of Yuanjiang River. The soil is alluvial sandy loam, light sticky texture to heavy soil. The year