广西植物2018，Vol.38Issue(6)：687-695,9.DOI:10.11931/guihaia.gxzw201710017
南方红壤丘陵区微地形对芒萁生长特征及其土壤肥力的影响
Effects of microtopography on Dicranopteris dichotoma growth characteristics and soil fertility in an experiment plot in red soil hilly region of South China
摘要
Abstract
Field work,laboratory experiment,geographic information system (GIS),and global positioning system (GPS) were used to explore how microtopography influenced the distribution of Dicranopteris dichotoma patches,growth characteristics,soil fertility factors and microenvironment factors in the experiment plot in Laiyoukeng of Changting County,Fujian Province,which is a typical representative of the red soil hilly region of China.The results were as fol-lows: (1) The percentage of microtopographites increased in order ridge ＜upper slope ＜middle slope ＜lower slope ＜valley in D.dichotoma patches.The ridge occupied 9.38%of the total area; the upper slope,the middle slope,and the lower slope were almost evenly distributed (18.55%,19.63%and 22.71%); the valley accounted for 28.43%of the total area in D.dichotoma patches.(2) There were significant differences in all D.dichotoma growth characteristics including plant height,plant density,aboveground biomass,underground biomass,and total biomass and part of soil fertility fac-tors including organic matter,total nitrogen(TN),alkali-hydrolyzable nitrogen(AN),available kalium(AK),and pH value among the three microtopographies (ridge,slope,and valley),respectively,and they tended to decrease in order from the valleys through the slopes to the ridges,respectively,while pH value tended to increase in the same order.TP,available P,TK,and ＜ 2 μm clay content were not significantly different among the three microtopographies,respec-tively.All D.dichotoma growth characteristics were significantly correlated positively with part of soil fertility factors (or-ganic matter,TN,AN and AK),respectively,while all D.dichotoma growth characteristics were significantly correlated negatively with pH value,respectively.There was no significant correlation between all D.dichotoma growth characteris-tics and other soil fertility factors [TP,available phosphorus(AP),TK,and＜ 2 μm clay content] (except for AP and plant density) ,respectively.(3) Surface temperature,temperature underground 5 cm,and moisture underground 5 cm showed statistically significant differences between the ridges and valleys,respectively (P＜0.05).Surface temperature and temperature underground 5 cm in the valleys were significantly lower than those of the ridges,respectively,while moisture underground 5 cm on the valleys was significantly higher than that of the ridges.(4) Microtopography plays an important role in D.dichotoma growth characteristics and soil fertility.Microtopography especially valley should be crea-ted to trigger the succession of D.dichotoma communities,so as to accelerate ecological restoration in the red soil hilly region of South China.关键词
生态恢复/植物-土壤系统/微地形/芒萁/中国南方红壤丘陵区Key words
ecological restoration/plant-soil system/microtopography/Dicranopteris dichotoma/red soil hilly region of South China分类
农业科技引用本文复制引用
曾月娥,陈志强..南方红壤丘陵区微地形对芒萁生长特征及其土壤肥力的影响[J].广西植物,2018,38(6):687-695,9.基金项目
国家自然科学基金(41371512) （41371512）
福建省社会科学规划项目(FJ2016C046) Supported by the National Natural Science Foundation of China(41371512) （FJ2016C046）
Social Science Planning Program of Fujian Province(FJ2016C046) （FJ2016C046）
