文献类型：期刊文献

中文题名：沙丘埋压对典型荒漠植物枝条枯落物分解的影响

英文题名：Effects of sand dune burial on the litter decomposition of desert plant branches

作者：杨岩岩[1] 刘连友[2] 吴波[1] 庞营军[1]

第一作者：杨岩岩

机构：[1]中国林业科学研究院生态保护与修复研究所,荒漠生态系统与全球变化国家林业和草原局重点实验室,北京100091;[2]北京师范大学地理科学学部,北京100875

年份：2025

卷号：45

期号：3

起止页码：313-325

中文期刊名：中国沙漠

外文期刊名：Journal of Desert Research

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金项目(41701095,41730639)。

语种：中文

中文关键词：沙丘埋压;荒漠植物;枯落物分解;质量损失;养分释放

外文关键词：sand dune burial;desert plants;decomposition of plant litters;mass loss;nutrient release

分类号：S812

摘要：荒漠植物是沙漠生态系统的核心。沙丘沿风向移动造成荒漠植物死亡,目前对植物死亡后枯落物在沙丘埋压状况下分解研究较少。本文通过遥感测算、样品采集和实验分析等方法,研究沙丘对典型荒漠植物白刺(Nitraria tangutorum)和小叶锦鸡儿(Caragana microphylla)埋压时长与沙丘形态关系以及沙丘埋压状况下荒漠植物枯落物分解特征。结果表明:(1)沙丘对荒漠植物埋压时长与沙丘形态参数呈显著幂函数正相关,与沙丘移动速度呈显著幂函数负相关,沙丘规模越大对植物埋压时间越长。(2)被埋压植物枝条枯落物质量损失率与埋压时长呈显著对数函数正相关。被沙丘埋压的前25年枝条枯落物的分解速率较大,年平均质量损失率达2.6%,之后分解速率趋于平缓。被沙丘埋压期间小叶锦鸡儿枝条枯落物分解速率大于白刺。荒漠植物枝条枯落物分解速率与其直径呈显著正相关。(3)沙丘埋压可导致植物枝条枯落物C和N元素富集,且富集程度随埋压时长的增加而增加。N元素富集程度明显高于C元素,但随埋压时长的增加呈减小趋势。研究结果将为准确预测干旱区荒漠植物碳周转速率提供科学依据。
Movement of sand dunes along wind directions can cause mortality of desert plants which are central to desert ecosystems.Currently,little is known about the decomposition of plant litter after death under dune burial conditions.In this paper,we investigated the relationship between the duration of dune burial on desert plants(Nitraria tangutorum and Caragana microphylla)and dune parameters of morphology and movement,as well as the decomposition characteristics of desert plants under dune burial by various methods,including remote sensing measurements,sample collection and experimental analysis.The results showed that:(1)The duration of sand dune burial on desert plants was positively and significantly correlated with its morphological parameters and negatively and obviously correlated with its movement speed in power functions,and the larger the dune volume or scale was,the longer the burial time of the plants was.(2)The mass loss rate of the buried desert plants was positively correlated with the duration of sand dune burial in a significant logarithmic function.In the first 25 years of dune compaction and burial,the decomposition rate was greater,and the annual average quality loss rate is 2.6%,after which the decomposition rate leveled off.The decomposition rate of Caragana microphylla branche litters was greater than that of Nitraria tangutorum during the period of dune compaction and burial.The decomposition rate of desert plant branch litters increased with the increase of diameter.(3)Dune burial could lead to the enrichment of organic C and N in the plant branch litters,and the enrichment degree increased with the increase of the duration of sand dune burial.And the enrichment degree of N was higher than that of organic C,but showed a decrease with the increase of the duration of sand dune burial.The results of this study will provide a scientific basis for the accurate prediction of the carbon turnover rate of desert plants in arid areas.