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落叶松人工林能否保持无机动态平衡、稳定生长,主要取决于每年还原于土壤中凋落物营养元素成分和数量。本研究目的在于揭示凋落物变化的各种规律,以及营养元素的潜在还原量。为改善林地条件,建立最佳结构模式的林分提供科学依据。为此我们对黑龙江省东部尚志县帽儿山兴安落叶松人工林四年凋落物营养元素进行了分析研究。结果表明: 1.落叶松树种的凋落物数量,包括叶、枝、皮等,四年平均每公顷干重量为3099.5kg,林内天然阔叶树为237.4kg,总计为3336.9kg。 2.不同种类凋落物营养元素的含量差异显著,叶含量最多,枝次之,皮中含量最小。 3.平均每年每公顷还原于林地的营养元素总量(N、P、K、Ca、Mg、Cu、Zn、Mn)为98.8697kg,其中落叶松叶为85.5998kg,阔叶树叶为8.385kg,落叶松落枝为2.0335kg,林内落叶松落皮为9.13kg,阔叶树枝为9.27kg。
Larix gmelinii plantation can maintain the dynamic balance of inorganic, stable growth, mainly depends on the annual reduction in soil litter nutrient composition and quantity. The purpose of this study is to reveal the various changes in litter, and the potential for nutrient reduction. Provide scientific basis for improving the condition of forest land and establishing the stand of the best structure model. For this reason, we analyzed and analyzed the four year litter nutrient elements of Larix gmelinii forest in Maoershan, Shangzhi County, Heilongjiang Province. The results showed that: 1. Larch species litter, including leaves, branches, peel and so on, the average annual dry weight per hectare for 4 years was 3099.5kg, the natural forest broad-leaved tree was 237.4kg, a total of 3336.9kg. Different types of litter nutrient content of significant differences, the leaf content of the most, followed by the branches, the smallest content in the skin. 3. The total amount of nutrients (N, P, K, Ca, Cu, Zn, Mn) per hectare per hectare reduced to woodland was 98.8697kg, including 85.5998kg for larch leaves, 8.385kg for broad-leaved leaves, Pine branches to 2.0335kg, forest larch drop to 9.13kg, broad-leaved branches to 9.27kg.