干旱地区农业研究
榦旱地區農業研究
간한지구농업연구
AGRICULTURAL RESEARCH IN THE ARID AREAS
2009年
4期
105-110
,共6页
甘薯%土壤水分%施肥方式%气体交换%调节作用
甘藷%土壤水分%施肥方式%氣體交換%調節作用
감서%토양수분%시비방식%기체교환%조절작용
sweet potato%soil water%fertilization form%gas exc hange%regulation
采用盆栽试验,以甘薯品种秦薯4号和619为材料,研究了不同土壤水分条件下施肥方式对甘薯叶片气体交换的影响.结果表明,土壤水分和施肥方式对甘薯叶片净光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)、气孔导度(Gs)、胞间CO2浓度(Ci)以及气孔限制值(Ls)有显著或极显著的影响,水肥之间存在明显的互作效应.与土壤湿润( 田间持水量70%～75%)相比,土壤轻旱(田间持水量40%～45%)对甘薯叶片Pn、Tr、WUE 、Gs、Ci以及Ls的影响较小,而重旱(田间持水量30%～35%)下,Pn、Tr、WUE、Gs和Gs 大幅下降,Ci明显上升.施肥有助于促进提高Pn、Tr、Gs以及Ls,降低Ci,而且氮磷配施的效果优于氮肥单施.Ci和Ls 的变化说明在土壤轻旱(40%～45%)条件下,甘薯叶片气体交换主要受气孔因素限制,而重旱(30%～35%)主要受非气孔因素限制.施肥通过改善气孔因素对甘薯叶片气体交换产生促进效应.
採用盆栽試驗,以甘藷品種秦藷4號和619為材料,研究瞭不同土壤水分條件下施肥方式對甘藷葉片氣體交換的影響.結果錶明,土壤水分和施肥方式對甘藷葉片淨光閤速率(Pn)、蒸騰速率(Tr)、水分利用效率(WUE)、氣孔導度(Gs)、胞間CO2濃度(Ci)以及氣孔限製值(Ls)有顯著或極顯著的影響,水肥之間存在明顯的互作效應.與土壤濕潤( 田間持水量70%～75%)相比,土壤輕旱(田間持水量40%～45%)對甘藷葉片Pn、Tr、WUE 、Gs、Ci以及Ls的影響較小,而重旱(田間持水量30%～35%)下,Pn、Tr、WUE、Gs和Gs 大幅下降,Ci明顯上升.施肥有助于促進提高Pn、Tr、Gs以及Ls,降低Ci,而且氮燐配施的效果優于氮肥單施.Ci和Ls 的變化說明在土壤輕旱(40%～45%)條件下,甘藷葉片氣體交換主要受氣孔因素限製,而重旱(30%～35%)主要受非氣孔因素限製.施肥通過改善氣孔因素對甘藷葉片氣體交換產生促進效應.
채용분재시험,이감서품충진서4호화619위재료,연구료불동토양수분조건하시비방식대감서협편기체교환적영향.결과표명,토양수분화시비방식대감서협편정광합속솔(Pn)、증등속솔(Tr)、수분이용효솔(WUE)、기공도도(Gs)、포간CO2농도(Ci)이급기공한제치(Ls)유현저혹겁현저적영향,수비지간존재명현적호작효응.여토양습윤( 전간지수량70%～75%)상비,토양경한(전간지수량40%～45%)대감서협편Pn、Tr、WUE 、Gs、Ci이급Ls적영향교소,이중한(전간지수량30%～35%)하,Pn、Tr、WUE、Gs화Gs 대폭하강,Ci명현상승.시비유조우촉진제고Pn、Tr、Gs이급Ls,강저Ci,이차담린배시적효과우우담비단시.Ci화Ls 적변화설명재토양경한(40%～45%)조건하,감서협편기체교환주요수기공인소한제,이중한(30%～35%)주요수비기공인소한제.시비통과개선기공인소대감서협편기체교환산생촉진효응.
To understand the regulating effects of soil water and fertilization on gas exchange in sweet potato leaves under different condit ions of soil water, with two cultivars of Qinshu 4 and 619 as materials, a pot e xperiment was conducted to measure and assay photosynthesis rate(Pn), water use efficiency(WUE), transpiration rate(Tr), stomatal conductance(Gs ), intercellular CO2 concentration(Ci) and stomatal limitation value(L s). The results showed that soil water and fertilization significantly influen ce Pn, Tr, WUE, Gs and Ls. An apparent interaction existed between soil water and fertilization. Compared to the soil water content of 70%～75%,the cha nges of Pn, Tr, WUE, Gs and Ls were smaller under the soil water of 40% ～45%, while under the soil water of 30%～35%, Pn, Tr, WUE, Gs and Ls, decreased significantly but Ci increased remarkably. Fertilization could enh ance Pn, Tr, WUE, Gs and Ls, but reduce Ci. The regulating effect of these indexes with combined application of nitrogen and phosphorus was better t han that with single application of nitrogen. The change of Ci and Ls un der different treatments showed the gas exchange of sweet potato leaves was main ly limited by stomatal factors under the soil water of 40%～45%, and was mainly limited by non-stomatal factors. Fertilization could promote the gas exchange o f sweet potato leaves by enhancing the effect of stomatal factors.
