沙漠公路防护林凋落物量、组成及动态

发布时间：2019-05-11 22:51

【摘要】：凋落物由植物产生并最终归还给土壤,为分解者提供物质和能量的来源。以塔克拉玛干沙漠公路沿线防护林为对象,2014年对各林龄防护林内的凋落物量、凋落物组成及动态变化进行研究。结果表明:沙漠公路8、10、13、16、19a防护林年总凋落量分别为8 301.96、9 089.71、10 540.64、6 184.70、7 929.95kg·hm-2。各林龄防护林凋落物组成均以乔木状沙拐枣(Calligonum arborescens)同化枝、梭梭(Haloxylon ammodendron)同化枝和多枝柽柳(Tamarix ramosissima)枝凋落物占的比例最大,3种凋落物总量占年总凋落量的比例分别为89.05%、79.16%、75.28%、78.75%、81.14%。各凋落物组分在不同林龄间差异显著(P0.05)。不同林龄防护林皆表现出春、秋季凋落量高,夏、冬季凋落量低的季节动态。各林龄防护林凋落物总量及主要凋落物的凋落量月动态变化曲线均呈现三峰型,在3—5月、7月和9—11月出现峰值,叶、果和其他的凋落量呈不规则变化,花只在4—8月凋落。
[Abstract]:Litter is produced by plants and eventually returned to the soil, providing a source of material and energy for decomposers. Taking the shelterbelt along Taklimakan Desert Highway as the object, the litter quantity, litter composition and dynamic changes in the shelterbelt of each forest age were studied in 2014. The results showed that the total annual litter loss of the shelterbelt was 8 301.96, 9 089.71, 10 540.64, 6 184.70, and 7 929.95kg 路hm-2. The litter composition of each forest age protection forest was (Calligonum arborescens) assimilation branch, Haloxylon ammodendron (Haloxylon ammodendron) assimilation branch and multi-branch Tamarix (Tamarix ramosissima) branch accounted for the largest proportion. The proportion of the total litter to the total annual litter was 89.05%, 79.16%, 75.28%, 78.75% and 81.14%, respectively. There were significant differences in litter components among different forest ages (P 0.05). The protective forests of different forest ages showed seasonal dynamics of high litter fall in spring and autumn and low litter fall in summer and winter. The monthly dynamic curves of the total litter amount and the main litter amount of the shelterbelt showed three peaks in March-May, July and September-November, and there were irregular changes in leaf, fruit and other litters, and there was no significant difference in the litter amount between March and May, July and September to November. Flowers only wither in April-August.
【作者单位】：中国科学院新疆生态与地理研究所国家荒漠-绿洲生态建设工程技术研究中心;新疆大学资源与环境科学学院;中国科学院大学;
【基金】：国家自然科学基金项目(41271341,41030530) 塔里木油田分公司综合项目(971012080007)
【分类号】：S714

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