The objective of this study was to understand the effects of forest gap and variations in different seasons, gap size, locations and diurnal variations on forest microclimate and soil water content. Spatial and tempor...The objective of this study was to understand the effects of forest gap and variations in different seasons, gap size, locations and diurnal variations on forest microclimate and soil water content. Spatial and temporal distribution features oi air temperature （TA）, soil temperature （Ts）, relative humidity （h） and soil water content （ψ） were measured in Castanopsis kawakamii natural forest gaps created by a severe typhoon or fallen dead trees. The results showed that： （1） the variations of TA, h, and Tsin four seasons were extremely significant. The variations of ψ in four seasons were extremely significant except for those between spring and summer. （a） The diurnal variations of TA and Tswere expressed with a single peak curve. The diurnal variations of h and ψ presented a high-low-high trend （3） The variations of TA, h, and Ts were extremely significant among the large, medium and small gaps in C. kawakamii natural forest. Medium gaps had the highest TA and the lowest h while small gaps were jusl contrary to medium gaps. The variations of T were extremely significant for large, medium and small gaps except those between the medium and large gaps （4） The TA, h, Ts and ψ were decreased from the gap center, canopy gap, expanded gap to understory. These results will help further our understanding of the abiotic and consequent biotic responses to gaps in the mid-subtropical broadleaved forests, which also provide a theoretical basis for the scientific management and population restoration of C. kawakamii natural forest.展开更多
Yongzhou often encounters drought condition in July and August. Sometimes no rainfall lasts for 20 to 40 days, causes a great damage to grape production Our four-year rice straw mulching test on vineyard indicates tha...Yongzhou often encounters drought condition in July and August. Sometimes no rainfall lasts for 20 to 40 days, causes a great damage to grape production Our four-year rice straw mulching test on vineyard indicates that if favorable mulching is supplied properly, it reduces soil temperature and conserves soil moisture in summer, increases soil temperature in winter, keeps soil loose and mellow, depresses weeds, and increases soil organic matter content in vineyard to secure good quality and higher yield even under drought condition.展开更多
基金supported by the Key Program of Natural Science Foundation of Fujian Province of China (Grant No. 2008J0008)Doctoral Fund of Ministry of Education of China (Grant No.200803890011)China Postdoctoral Science Foundation (Grant No. 20070410796)
文摘The objective of this study was to understand the effects of forest gap and variations in different seasons, gap size, locations and diurnal variations on forest microclimate and soil water content. Spatial and temporal distribution features oi air temperature （TA）, soil temperature （Ts）, relative humidity （h） and soil water content （ψ） were measured in Castanopsis kawakamii natural forest gaps created by a severe typhoon or fallen dead trees. The results showed that： （1） the variations of TA, h, and Tsin four seasons were extremely significant. The variations of ψ in four seasons were extremely significant except for those between spring and summer. （a） The diurnal variations of TA and Tswere expressed with a single peak curve. The diurnal variations of h and ψ presented a high-low-high trend （3） The variations of TA, h, and Ts were extremely significant among the large, medium and small gaps in C. kawakamii natural forest. Medium gaps had the highest TA and the lowest h while small gaps were jusl contrary to medium gaps. The variations of T were extremely significant for large, medium and small gaps except those between the medium and large gaps （4） The TA, h, Ts and ψ were decreased from the gap center, canopy gap, expanded gap to understory. These results will help further our understanding of the abiotic and consequent biotic responses to gaps in the mid-subtropical broadleaved forests, which also provide a theoretical basis for the scientific management and population restoration of C. kawakamii natural forest.
文摘Yongzhou often encounters drought condition in July and August. Sometimes no rainfall lasts for 20 to 40 days, causes a great damage to grape production Our four-year rice straw mulching test on vineyard indicates that if favorable mulching is supplied properly, it reduces soil temperature and conserves soil moisture in summer, increases soil temperature in winter, keeps soil loose and mellow, depresses weeds, and increases soil organic matter content in vineyard to secure good quality and higher yield even under drought condition.
