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帽儿山林区山杨、水曲柳林分类型凋落物层研究
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作者 张东来 《黑龙江生态工程职业学院学报》 2007年第1期33-35,共3页
针对帽儿山林区的水曲柳、山杨两种主要林分类型林下凋落物层进行细致的研究,结果表明,两种林分内凋落物层的贮量分别是:水曲柳林1350.0kg/hm2,山杨林3933.4kg/hm2。山杨样地内凋落物层平均总持水量达5.55t/hm2,平均持水率为139.5%;水... 针对帽儿山林区的水曲柳、山杨两种主要林分类型林下凋落物层进行细致的研究,结果表明,两种林分内凋落物层的贮量分别是:水曲柳林1350.0kg/hm2,山杨林3933.4kg/hm2。山杨样地内凋落物层平均总持水量达5.55t/hm2,平均持水率为139.5%;水曲柳样地半分解层持水量为2.233t/hm2,平均持水率为165.4%,这从一定程度上反映了凋落物层的拦蓄降水、调节森林生态系统水量平衡的生态功能。微生物数量和土壤酶活性各层有所不同。山杨林从两层各元素总贮量来看则是N>P>K>Ca>Mg;水曲柳林各元素贮量大小顺序为N>P>Ca>K>Mg。 展开更多
关键词 水曲柳 山杨 凋落物层 帽儿山林区
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帽儿山森林生态系统蚯蚓种群动态研究 被引量:2
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作者 黄初龙 张雪萍 黄丽荣 《森林工程》 北大核心 2004年第1期3-4,共2页
帽儿山林区蚯蚓平均种群密度为 19 6 9ind /m2 ,平均生物量为 7 72 g/m2 ,全年蚯蚓的数量变化规律是 :初秋 >夏末 >春末夏初 >仲秋 >盛夏。水热条件的变化是造成蚯蚓数量动态变化的主要原因。蚯蚓对水热因子有一定的耐受限... 帽儿山林区蚯蚓平均种群密度为 19 6 9ind /m2 ,平均生物量为 7 72 g/m2 ,全年蚯蚓的数量变化规律是 :初秋 >夏末 >春末夏初 >仲秋 >盛夏。水热条件的变化是造成蚯蚓数量动态变化的主要原因。蚯蚓对水热因子有一定的耐受限度 ,最适宜温度范围是 15~ 2 0℃ ,最适含水量范围是 5 5 %~ 6 5 %。 展开更多
关键词 帽儿山林区 森林生态系统 蚯蚓 种群动态 水热条件 种群密度 生物量
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Spatial connectivity and distribution of landscape type in the natural secondary forests of eastern mountainous region,northeast China——a case study of Mao'ershan region in Heilongjiang Province
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作者 李淑娟 隋玉正 +2 位作者 冯海清 王凤友 李玉文 《Journal of Forestry Research》 SCIE CAS CSCD 2004年第2期141-144,i003,共5页
Mao'ershan region is representative in the natural secondary forested region of the eastern mountainous region, northeast China. The landscape nearest neighbor index and landscape connectivity index were calculate... Mao'ershan region is representative in the natural secondary forested region of the eastern mountainous region, northeast China. The landscape nearest neighbor index and landscape connectivity index were calculated with ARC/INFO software for Mao'ershan region. The spatial distribution of the landscape of the region was analyzed. The results showed that the landscape connectivity index of non-woodland was significantly higher than that of woodland. The landscape connectivity index of natural forest was nearly equal to zero, which means its fragmentation degree is high. The nearest neighbor index of plantation was lower than that of natural forest and non-forestland. Among the man-made forests, the distance index of the coniferous mixed plantation is the lowest, and its pattern is nearly glomeration. The landscape pattern of natural forest presented nearly random distribution. Among non-forest land, the distance index of cut blank was the lowest, and its pattern was also nearly glomeration. Keywords Landscape type - Landscape pattern - Nearest neighbor index - Landscape connectivity index - Natural secondary forest - Northeast China CLC number S759.92 Document code A Foundation item: This paper was supported by the Key Project of State Department of Science Technology (2002BA515B040).Biography: LI SHu-juan (1977), female. Lecture in Ocean University of China, Qingdao 266003, P. R. China.Responsible editor: Zhu Hong 展开更多
关键词 Landscape type Landscape pattern Nearest neighbor index Landscape connectivity index Natural secondary forest Northeast China
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