Dry matter accumulation and allocation in spring wheat mulched with plastic film in Loess Plateau
黄土高原地膜春小麦地上干物质累积与转运规律

A 2-year field experiment was conducted to study the accumulation and allocation of dry matter in the aboveground part of spring wheat mulched and un-mulched with plastic film in semi-arid Loess Plateau.The results showed that under mulching,the maximum leaf area of individual plant increased by 17.16%,the peak value of maximum green leaf area appeared 6 days earlier,and the dry matter accumulation rate before florescence was 8.97% higher,compared with the control(un-mulching).The outputs of leaf,shoot,husk,and spike-stalk of mulched wheat were 3.23%-3.67%,3.53%-4.55%,and 1.80%-3.63% higher than those of un-mulched wheat,respectively.Comparing with un-mulched wheat,mulched wheat had higher translocation rate of dry matter from non-economic organs to the grain,higher initial growth potential,higher maximum growth rate,longer active growth stage,and shorter duration reaching the maximum growth rate,suggesting that film munched wheat had stronger growth potential,faster milking rate,and longer milking duration,which finally led to a higher grain mass and a 36% increment of grain yield.