摘要
为深入解析热带地区胶农复合林土壤饱和导水率(Ks)的空间分布特征,及应对橡胶林的土地退化和季节性干旱问题,本研究在云南省勐腊县中国科学院西双版纳热带植物园橡胶-益智(Hevea brasiliensis-Alpinia oxyphylla)复合林建立试验小区(25 m×11 m),随机选取40个小样方,测定Ks、土壤容重、非毛管孔隙度和田间持水量,采用普通克里金插值法、地统计学、通径分析方法解译和分析橡胶-益智复合林土壤饱和导水率的空间分布格局、变异特征及其影响因子。结果表明:益智种植带Ks显著大于橡胶种植带(P<0.01),且Ks随距益智种植带的距离增大而降低;受结构性因素影响,Ks与田间持水量都表现出强烈的空间自相关性(块金系数C0/(C0+C)≤25%);Ks与土壤容重呈显著负相关(-0.613,P<0.01),与非毛管孔隙度(0.408,P<0.01)、田间持水量(0.352,P<0.05)均呈显著正相关,经多元线性回归分析发现Ks的主控因子是土壤容重,说明橡胶林间作益智有助于降低土壤容重,增加土壤孔隙,从而调节土壤水分入渗速率。
Rubber-based agroforestry in the humid tropical region is a strategy to alleviate land degradation and seasonal drought under rubber monoculture plantations.We analyzed the spatial characteristics of saturated hydraulic conductivity(Ks,a measure of soil water availability)under rubber-Alpinia oxyphylla agroforestry in the humid tropical region of Southwest China.The experiment was conducted in the Xishuangbanna Tropical Botanical Garden by establishing a permanent plot(25 m×11 m)under a rubber-A.oxyphylla agroforestry.A total of 40 quadrats were established for measuring the Ks,soil bulk density,non-capillary porosity,and field water-holding capacity.The ordinary kriging interpolation,path analysis and geostatistics method were used to analyze Ks spatial distribution pattern,variation characteristics and its controlling factors in rubber-A.oxyphylla agroforestry.The Ks was significantly higher(P<0.01)in A.oxyphylla planting zone than in rubber planting zone,and Ks decreased with the increases of the distance from the A.oxyphylla planting zone.Affected by structural factors,both Ks and field waterholding capacity showed a strong positive spatial autocorrelation(nugget coefficient C0/(C0+C)≤25%).Ks was significantly negatively correlated with soil bulk density(-0.613,P<0.01),but positively correlated with non-capillary porosity(0.408,P<0.01)and field water-holding capacity(0.352,P<0.01).Results of the multiple linear regression analysis showed that soil bulk density was the main controlling factor for Ks,indicating that intercropping A.oxyphylla with rubber could reduce bulk density,enhance soil porosity,and thus improve soil water infiltration.
作者
王浩飞
王黎
朱习爱
刘文杰
蒋小金
WANG Haofei;WANG Li;ZHU Xiai;LIU Wenjie;JIANG Xiaojin(Key Laboratory of Tropical Forest Ecology,Mengla 666303,Yunnan,China;University of Chinese Academy of Sciences,Beijing 100049,China;Puer University,Puer 665000,Yunnan,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2023年第9期2113-2120,共8页
Chinese Journal of Ecology
基金
国家自然科学基金(41701029和32271648)
云南省基础研究计划(2018FB076、2019FI011、202101AT070056、202101AS070010和202201AT070216)资助。
关键词
橡胶
益智
复合林
饱和导水率
空间格局
地统计学
rubber
Alpinia oxyphylla
agroforestry
saturated hydraulic conductivity
spatial pattern
geostatistics
作者简介
王浩飞,男,1998年生,硕士研究生,主要研究方向为橡胶林生态水文。E-mail:wanghaofei@xtbg.ac.cn;通信作者:蒋小金,E-mail:jiangxiaojin@xtbg.ac.cn。
