CAJ | 학술논문

对苜蓿进行不同土层深度断根处理,以阻断其不同深层根系对土壤水分的吸收,研究苜蓿地上部分株高生长的反馈特征.结果表明:苜蓿在不同土层断根当年,各深度的断根处理均使苜蓿株高生长受到一定抑制,与对照相比有所降低.不同层次断根的苜蓿在断根当年浅层次断根(20、40、60 cm)受到的水分胁迫较其它处理严重.在断根初期(半个月)与对照呈极显著差异;在收获期株高与对照(26.70 cm)相比,株高分别降低了13.10、12.85、11.30 cm,表现为断根越浅,影响越大.各处理在断根的次年,苜蓿返青期的株高变化曲线十分平缓.收获期断根处理20、40、230 cm的苜蓿株高比对照(37.96 cm)分别降低了5.08、5.34、5.30 cm,较对照差异性极显著(P<0. 01),各断根处理较断根当年株高的生长量均有显著提高.两年的数据表明浅层次断根处理的株高生长受到水分胁迫较深层断根处理严重.不同土层断根处理的株高生长受抑制程度为:浅层次处理＞中层次处理＞深层次处理.
대목숙진행불동토층심도단근처리,이조단기불동심층근계대토양수분적흡수,연구목숙지상부분주고생장적반궤특정.결과표명:목숙재불동토층단근당년,각심도적단근처리균사목숙주고생장수도일정억제,여대조상비유소강저.불동층차단근적목숙재단근당년천층차단근(20、40、60 cm)수도적수분협박교기타처리엄중.재단근초기(반개월)여대조정겁현저차이;재수획기주고여대조(26.70 cm)상비,주고분별강저료13.10、12.85、11.30 cm,표현위단근월천,영향월대.각처리재단근적차년,목숙반청기적주고변화곡선십분평완.수획기단근처리20、40、230 cm적목숙주고비대조(37.96 cm)분별강저료5.08、5.34、5.30 cm,교대조차이성겁현저(P<0. 01),각단근처리교단근당년주고적생장량균유현저제고.량년적수거표명천층차단근처리적주고생장수도수분협박교심층단근처리엄중.불동토층단근처리적주고생장수억제정도위:천층차처리＞중층차처리＞심층차처리.
Study was made on the growth situation of alfalfa root in the different soil depths after cutting lateral root. The results showed that in the current year of cutting lateral root, alfalfa height growth was inhibited and decreased compared with the control. Alfalfa root in the shallow depths (20 cm, 40 cm and 60 cm depths) treatment had more serious water stress, than other treatments. There were very significant differences(P<0.01) between the early stage of cutting lateral root and the control. In the harvest period, plant height decreased by 13.10 cm, 12.85 cm and 11.30 cm compared to the control respectively. It showed that the shallower the root cutting was made, the more seriously it affected alfalfa. In the second year of cutting lateral root, the alfalfa height curve is very flat in the green stage. In the harvest period of cutting lateral root at 20 cm, 40 cm and 60 cm depths, the plant height decreased by 5.08 cm, 5.34 cm and 5.30 cm compared to the control(37.96 cm) respectively. The differences were significant (P<0.01). The data in two years showed that the alfalfa height growth in shallow level treatments was more seriously affected by water stress than other treatments. The level of alfalfa inhibition growth of different soil layers by different cutting lateral root is shallow level treatment＞medium level treatment＞deep treatment.