摘要
通过野外采样与室内分析相结合,研究白刺灌丛沙堆在演替过程中土壤粒度与分形维数特征,分形维数与土壤粒级及土壤理化性质的关系。结果表明:1)民勤不同演替阶段白刺灌丛沙堆土壤均以细砂(46.71%-64.06%)为主;土壤分形维数变化为1.665-2.242,在白刺灌丛沙堆演替过程中分形维数呈现先升高后降低的趋势,衰退阶段达到最大值。2)分形维数与黏粒、粉粒、极细砂呈极显著正相关(P<0.01),与中砂呈极显著负相关(P<0.01),说明黏粉粒、极细砂含量越多,土壤分形维数越高。3)分形维数与有机质、全氮含量呈极显著正相关(P<0.01),与速效磷含量呈显著正相关(P<0.05),土壤分形维数可以用来评价土壤的养分状况。研究结果可为荒漠灌丛发挥防风固沙和土壤保育功能的定量化评价提供科学依据。
Through the combination of field sampling and laboratory analysis,the characteristics of soil particle size and fractal dimension during Nitraria tangutorum shrub succession were analyzed,and the relationship between fractal dimension and soil particle size and soil physical and chemical properties were studied.The results showed that 1)the soil of N.tangutorum shrub in different succession stages was dominated by fine sand(46.71%-64.06%);the soil fractal dimension varied from 1.665 to 2.242,during the succession,the soil fractal dimension firstly increased and then decreased,and reached the maximum in the decline stage.2)The soil fractal dimension had a very significantly positive correlation with clay,silt and very fine sand(P<0.01),and a very significantly negative correlation with medium sand(P<0.01),indicating that the more clay,silt and very fine sand contents,the higher the soil fractal dimension.3)The fractal dimension was significantly and positively correlated with organic matter and total nitrogen content(P<0.01),and with available phosphorus content(P<0.05).Soil fractal dimension could be used to evaluate soil nutrient status.The results could provide a scientific basis for the quantitative evaluation of desert shrub's functions of wind prevention,sand fixation,and soil conservation.
作者
马剑平
王飞
郭树江
纪永福
张莹花
张裕年
张卫星
宋达成
MA Jian-ping;WANG Fei;GUO Shu-jiang;JI Yong-fu;ZHANG Ying-hua;ZHANG Yu-nian;ZHANG Wei-xing;SONG Da-cheng(Gansu Desert Control Research Institute,Lanzhou 730070,Gansu,China;State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Wuwei 733000,Gansu,China;Gansu Minqin National Studies Station for Desert Steppe Ecosystem,Minqin 733300,Gansu,China)
出处
《西北林学院学报》
CSCD
北大核心
2022年第5期46-52,共7页
Journal of Northwest Forestry University
基金
甘肃省青年科技基金计划项目(20JR10RA469)
国家青年科学基金项目(31700339)
国家自然科学基金(31860116,31960334,31760238)
甘肃省自然科学基金(20JR5RA096)
中国科学院“西部之光”人才培养计划“西部青年学者”项目。
关键词
白刺灌丛沙堆
粒径分布
分形维数
理化性质
民勤
Nitraria tangutorum shrub
particle size distribution
fractal dimension
physical and chemical property
Minqin
