CAJ | 학술논문

在陇东黄土高原雨养农业区,以传统耕作(t)为对照,研究了3种保护性耕作:耕作+秸秆覆盖(ts)、免耕(nt)、免耕+秸秆覆盖(nts)对玉米-大豆-小麦轮作系统产量和土壤全氮、全碳、有机碳,易氧化有机碳及碳库管理指数的影响.结果表明,从2001至2007年,10茬作物的总产量在ts、nts处理下分别比t提高3.63和1.62 t/hm~2,而nt处理则比t处理显著降低2.48 t/hm~2.7年后,t、ts、nt和nts处理表层土壤全氮含量分别提高15.4%,30.2%, 16.2%和49.5%.总有机碳含量相应提高2.5%,18.7%,11.7%和74.0%,易氧化有机碳含量在ts,nt和nts处理下分别比t处理提高16.0%,16.2%和38.1%;土壤碳氮比在t、ts、nt和nts处理下较之7年前分别降低了11.41%,8.54%,3.91%和2.72%,ts、nt和nts处理下碳库管理指数分别比t处理提高12.6%,20.1%和46.6%,说明秸秆覆盖+免耕均有利于提高该轮作系统中土壤有机碳含量并改善碳库质量.
재롱동황토고원우양농업구,이전통경작(t)위대조,연구료3충보호성경작:경작+갈간복개(ts)、면경(nt)、면경+갈간복개(nts)대옥미-대두-소맥륜작계통산량화토양전담、전탄、유궤탄,역양화유궤탄급탄고관리지수적영향.결과표명,종2001지2007년,10치작물적총산량재ts、nts처리하분별비t제고3.63화1.62 t/hm~2,이nt처리칙비t처리현저강저2.48 t/hm~2.7년후,t、ts、nt화nts처리표층토양전담함량분별제고15.4%,30.2%, 16.2%화49.5%.총유궤탄함량상응제고2.5%,18.7%,11.7%화74.0%,역양화유궤탄함량재ts,nt화nts처리하분별비t처리제고16.0%,16.2%화38.1%;토양탄담비재t、ts、nt화nts처리하교지7년전분별강저료11.41%,8.54%,3.91%화2.72%,ts、nt화nts처리하탄고관리지수분별비t처리제고12.6%,20.1%화46.6%,설명갈간복개+면경균유리우제고해륜작계통중토양유궤탄함량병개선탄고질량.
The effects of conventional tillage (t), conventional tillage with stubble retention (ts), no-tillage (nt), and no-tillage with stubble retention (nts) treatment on crop yield,soil total nitrogen and carbon, total organic carbon,oxdizible organic carbon, and carbon pool management index (CPMI) were investigated within a maize-wheat-soy rotation system in the western Loess Plateau. Total crop yield for ten harvests during the years 2001 to 2007 under ts and nts treatments increased by 3.63 and 1.62 g/kg compared with conventional tillage, but decreased by 2.48 g/kg on the nt treatment. Total nitrogen contents under nts treatment were 15.4%, 30.2% and 16.2% higher than t, ts and nt treatments. Total carbon under nts treatment was significantly increased by 2.04 g/kg and total organic carbon were 2.50, 1.56 and 1.70 g/kg higher than under t, ts and nt treatment, respectively. Easily oxdized organic carbon under nts was 2.13 g/kg higher than under t treatment. TN/TC decreased by 12.75%,15.97%,6.87% and 24.16% under t, ts, nt and nts treatments. The CPMI under ts, nt and nts were 12.6%,20.1% and 46.6% higher than under t,both stubble retention and no-till were beneficial to increasing the soil organic carbon content and improving the quality of the carbon pool.