科尔沁沙地沙丘生境单元凋落物运移特征

doi:10.7522/j.issn.1000-694X.2015.00009

摘要/Abstract

摘要： 通过测定科尔沁沙地沙丘生境单元凋落物的运移量,分析了沙丘类型和生境变化对凋落物运移的影响,并探讨了是否可以通过凋落物运移量的变化来判断营养物质的迁移。结果表明:科尔沁沙地沙丘凋落物的运移过程主要发生在非生长季,呈明显的单峰型季节波动。凋落物运移量在不同沙丘的丘间地、迎风坡、丘顶和背风坡均表现出明显的空间差异性,丘顶的凋落物运移量最大,迎风坡次之,丘间地和背风坡相对较小。凋落物运移量有随距地表高度增加而下降的趋势,距地表高度为0~25 cm时,凋落物运移量最大,显著高于25~50、50~75、75~100 cm 3个高度区间。凋落物运移量与风速在流动沙丘、半固定沙丘和固定沙丘均呈显著的二次曲线正相关,显示风速是影响凋落物运移量动态变化的重要因素。

关键词: 科尔沁沙地, 生境单元, 风速, 凋落物运移量

Abstract: Through the observation of litter migration flux among windward slope, top, leeward slope and inter-dune in different sand dunes, we analyzed the responses of litter migration to different habitats and sand dunes, and tried to explore the changes of litter migration for identifying the dynamics and allocation patterns of nutrients. The results showed that the process of litter migration was mainly observed during the non-growing seasons, coinciding with high litter production and strong wind. Litter migration flux varied markedly among the 4 habitat units in different sand dunes, being much higher at dune top and windward slope while much lower in the leeward slop and inter-dune. Additionally, there is a decreasing trend of the litter migration flux along the increase of height from the ground, and litter migration flux were significantly greater at height of 0-25 cm than at height of 25-50 cm, 50-75 cm and 75-100 cm. Whether in mobile dune, semi-fixed dune and fixed dune, there was a significant positive quadratic correlation between wind velocity and litter migration flux. In summary, the dynamic changes of litter migration flux were generally directly related to wind velocity.

Key words: Horqin Sandy Land, habitat units, wind velocity, litter migration flux

中图分类号:

:Q948.11

王新源, 赵学勇, 李玉霖, 陈翔舜, 王小军, 云建英. 科尔沁沙地沙丘生境单元凋落物运移特征[J]. 中国沙漠, 2016, 36(1): 167-173.

Wang Xinyuan, Zhao Xueyong, Li Yulin, Chen Xiangshun, Wang Xiaojun, Yun Jianying. Characteristics of Litter Migration in Habitat Units of Dunes in the Horqin Sandy Land[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(1): 167-173.

参考文献

[1] 王凤友.森林凋落量研究综述[J].生态学进展, 1989,6(2):82-89.
[2] 张新平,王襄平,朱彪,等.我国东北主要森林类型的凋落物产量及其影响因素[J].植物生态学报,2008,5(32):1031-1040.
[3] Witkamp M.Microbial populations of leaf litter in relation to environmental conditions and decomposition[J].Ecology,1963,44(2):370-377.
[4] Gray J T,Schlesinger W H.Biomass,production,and litter fall in the coastal sage scrub of southern California[J].American Journal of Botany,1981,68:24-33.
[5] 王新源,赵学勇,李玉霖,等.环境因素对干旱半干旱区凋落物分解的影响研究进展[J].应用生态学报,2013,24(11):3300-3310.
[6] 赵哈林,周瑞莲,赵学勇,等.科尔沁沙地沙漠化正,逆过程的地面判别方法[J].中国沙漠,2008,28(1):8-15.
[7] 李玉强,赵哈林,李玉霖,等.科尔沁沙地不同生境土壤氮矿化/硝化作用研究[J].中国沙漠,2009,29(3):438-444.
[8] 李得禄,满多清,朱国庆,等.丘间低地不同部位风沙流结构特征[J].中国沙漠,2012,32(5):1210-1215.
[9] 孟庆涛,李玉霖,赵学勇,等.科尔沁沙地不同环境条件下植物叶凋落物CO₂释放研究[J].干旱区研究,2008,25(4):519-524.
[10] Cornelissen J H,Van Bodegom P M,Aerts R,et al.Global negative vegetation feedback to climate warming responses of leaf litter decomposition rates in cold biomes[J].Ecology Letters,2007,10(7):619-627.
[11] Jacobson K M,Jacobson P J.Rainfall regulates decomposition of buried cellulose in the Namib Desert[J].Journal of Arid Environments,1998,38(4):571-583.
[12] Liu P,Huang J,Sun O J,et al.Litter decomposition and nutrient release as affected by soil nitrogen availability and litter quality in a semiarid grassland ecosystem[J].Oecologia,2010,162(3):771-780.
[13] 李玉霖,孟庆涛,赵学勇,等.科尔沁沙地植物成熟叶片性状与叶凋落物分解的关系[J].生态学报,2008,28(6):2486-2494.
[14] Bray J R,Gorham E.Litter production in forests of the world[J].Advances in Ecological Research,1964,2:101-157.
[15] Clark D A,Brown S,Kicklighter D W,et al.Net primary production in tropical forests:an evaluation and synthesis of existing field data[J].Ecological Applications,2001,11(2):371-384.
[16] 温明章,郭继勋.不同凋落物量对东北羊草草原土壤生物的影响[J].中国草地学报,2008,30(5):7-12.
[17] 官丽莉,周国逸,张德强,等.鼎湖山南亚热带常绿阔叶林凋落物量20年动态研究[J].植物生态学报,2004,28(4):449-456.
[18] 张华.科尔沁沙地不同下垫面风沙流结构与变异特征[J].水土保持学报,2002,16(2):20-23.
[19] Cornwell W K,Cornelissen J H,Amatangelo K,et al.Plant species traits are the predominant control on litter decomposition rates within biomes worldwide[J].Ecology Letters,2008,11(10):1065-1071.
[20] Zhang D,Hui D,Luo Y,et al.Rates of litter decomposition in terrestrial ecosystems:global patterns and controlling factors[J].Journal of Plant Ecology,2008,1(2):85-93.
[21] 李玉霖,孟庆涛,赵学勇,等.科尔沁沙地流动沙丘植被恢复过程中群落组成及植物多样性演变特征[J].草业学报,2008,16(6):54-61.
[22] 宗芹,阿拉木萨,骆永明,等.科尔沁沙地沙丘迎风坡面干沙层的空间分布[J].应用生态学报,2012,23(004):875-880.
[23] 尚润阳,祁有祥,赵廷宁,等.植被对风及土壤风蚀影响的野外观测研究[J].水土保持研究,2006,13(4):37-39.
[24] 李钢铁,贾玉奎,王永生.乌兰布和沙漠风沙流结构的研究[J].干旱区资源与环境,2004,18(1):276-278.
[25] 哈斯.腾格里沙漠东南缘沙丘表面风沙流结构变异的初步研究[J].科学通报,2004,49(11):1009-1140.
[26] 董玉祥,马骏.风速对海岸沙丘表面风沙流结构影响的实证研究[J].干旱区资源与环境,2009,23(9):179-183.
[27] 吴晓旭,邹学勇,王仁德,等.毛乌素沙地不同下垫面的风沙运动特征[J].中国沙漠,2011,31(4):828-835.
[28] 魏晶,吴钢,邓红兵.长白山高山冻原生态系统凋落物养分归还功能[J].生态学报,2004,24(10):2211-2216.