Soil cultivation systems and passes of agricultural tractors wheels are important factors influencing the soil propertie......

Water availability is a major constraint for wheat production in many semiarid regions of the world,including the Loess ......

采用蒽酮比色法、Ｗａｒｂｕｒｇ呼吸计法分别研究了杉木、檫树及其混交林吸收根的可溶性糖含量和呼吸速率；用愈创森酚法及双缩脲法了根系过化物酶......