【摘要】 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。更多还原

【Abstract】 The nutritional elements contained in the litter accumulated for 4 years from larch plantation were analyzed. It is found that the larch annually produces 3099.5kg/ha of oven-dried fallen materials composed of leaves,branches,bark and so on, and the broadleaved-trees produce 237.4kg/ha, totalling 3336.9kg/ha. The analysis results show that the concentiaticns of the nutrients vaiy significaatly with different litter containing leaves the most and bark the least. The elements that returned to the soil, including N,P,K,Ca,Mg,Zn,Mn, amount to 98.8697kg, among whing are 85.5998kg from larch leaves, 10.8385kg fiom broadleaved-tree leaves, 2.0335kg fiom larch branch, 0.13kg from larch bark, and 0.27kg from broadleaved-tree bark.更多还原