CAJ | 학술논문

种植密度增加有利于提高玉米产量，但也增加了群体水分的竞争。为了研究玉米穗下节间和根系水分状况对密度的响应，文章以春玉米为对象，在低密（4.50万株· hm-2）、中密（6.75万株· hm-2）和高密（9.00万株· hm -2）条件下测定玉米茎秆和根系水分状况。结果显示在生育前期，茎秆含水量受密度影响较小，而生育后期其茎秆含水量受密度影响较大。根系中的第一至第四层节根的含水量均值密度影响较小，而第五至第七层节根的含水量受密度影响较大，且中密条件下最高，其次是高密，低密条件下最低。而第一至第四层节根的相对含水量以低密条件下最高，中密次之，高密条件下最低；而第五至第七层节根相对含水量以中密条件下为最高，其次为低密，高密条件下最低。图6，参19。
충식밀도증가유리우제고옥미산량，단야증가료군체수분적경쟁。위료연구옥미수하절간화근계수분상황대밀도적향응，문장이춘옥미위대상，재저밀（4.50만주· hm-2）、중밀（6.75만주· hm-2）화고밀（9.00만주· hm -2）조건하측정옥미경간화근계수분상황。결과현시재생육전기，경간함수량수밀도영향교소，이생육후기기경간함수량수밀도영향교대。근계중적제일지제사층절근적함수량균치밀도영향교소，이제오지제칠층절근적함수량수밀도영향교대，차중밀조건하최고，기차시고밀，저밀조건하최저。이제일지제사층절근적상대함수량이저밀조건하최고，중밀차지，고밀조건하최저；이제오지제칠층절근상대함수량이중밀조건하위최고，기차위저밀，고밀조건하최저。도6，삼19。
Competition is increased for water sources with the increase of planting density in maize .This study investigates the effect of planting density on the water content of stalk and root.A field experiment based on a spring maize variety and three planting densities ( LD:4.50 ×10 4 plant· hm -2, MD :6.75 ×10 4 plant· hm-2 and HD:9.00 ×10 4 plant· hm-2 ) was carried out.The result showed that there was a minor effect from planting densities on the water content of stalk in earlier stages , whereas there was a greater effect of planting densities on the water content of stalk in later stages.The average water content of nodal root from the 5th to 7th layers under MD took the first place , which under HD took the second place and which under LD was lowest.The average relative water content of nodal root from 1st to 4th layers under LD took the first place , which under MD took the second place and which under HD was lowest , whereas that of nodal root from 5th to 7th layers under MD took the first place , which under LD took the second place and which under HD was lowest.