Potential application of oat for phytoremediation of salt ions in coastal saline-alkali soil
Potential application of oat for phytoremediation of salt ions in coastal saline-alkali soil
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DOI：
10.1016/j.ecoleng.2013.09.034
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发表时间：
2013-12
影响因子：
3.8
通讯作者：
Lipu Han;Huitao Liu;Shuhui Yu;Wenhui Wang;Jintong Liu
中科院分区：
文献类型：
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作者：
Lipu Han;Huitao Liu;Shuhui Yu;Wenhui Wang;Jintong Liu
生物改良盐碱地是一种战略性的水土保持方法。为了研究燕麦对植物修复的能力，在中国北部沿海地区进行了两因素随机区组设计试验。分析了燕麦品种(巴优1号、华早2号和白燕2号)和土壤盐度(1、2、3 g/kg−1)对燕麦生物量、秸秆离子积累量和秸秆-土壤离子浓度比的影响。结果表明，燕麦生物量受收获时间和土壤盐分的影响。BU生物量因收割延迟20天而减少0.4t/ha−1。生物量下降严重，从低盐度的3.1t/ha−1下降到高盐度的0.4t/ha−1。秸秆离子浓度(除Ca~(2+)外)在延迟收获时显著下降，但随着土壤盐度的增加而增加，而K~+浓度则显著降低。秸秆离子积累量以成熟期最高(BU为146.4 kg/ha−_1)，土壤盐分含量较低(100.2 kg/ha−_1by)，并随着时间的推迟和土壤盐分的增加而急剧下降。无论是推迟采收期还是增加土壤盐分，茎中离子变化均显着低于叶中离子变化。在中等土壤盐分浓度下，BU、BY和HZ的秸秆-土壤总离子浓度比分别为31.7、32.5和31.3。相关分析表明，燕麦离子积累量与生物量呈正相关。此外，秸秆Na+和Cl-−积累量分别与K+呈负相关(p<；P<0.05)。由此可见，燕麦是改良盐碱地的一种有潜力的植物。但由于生物量低，耐盐性差，限制了其在中国北部滨海盐碱地的实际应用。
Improvement of saline-alkali soils by biological means is a strategic soil conservation method. To investigate the capacity of oat for phytoremediation, two factor randomized block design experiments are carried out in coastal North China. The two factors — oat variety (“Ba You-1” – BU, “Hua Zao-2” – HZ and “Bai Yan-2” – BY) and soil salinity (1.0, 2.0 and 3.0 g kg−1) — are analyzed for oat biomass, straw ion accumulation and straw-to-soil ion concentration ratio. Results show that oat biomass be affected by harvest time and soil salinity. BU biomass decreases by 0.4 t ha−1for harvest delay by 20 days. And BY biomass drops severely which from 3.1 t ha−1in low soil salinity to 0.4 t ha−1in high soil salinity. The straw ion concentration (except Ca2+) significantly drops when harvest is delayed, but it increases with soil salinity increases though K+concentration markedly decreases. For the straw ion accumulation, the highest value for harvest time is at maturity (146.4 kg ha−1for BU) and for soil salinity is at low level (100.2 kg ha−1for BY) and it turns sharp decrease with the time delaying and soil salinity increasing. Ions changes in stem significantly lower than that of in leaf whatever delay harvest time or increases soil salinity. Under medium soil salt concentration, the straw-to-soil total ion concentration ratios are respectively 31.7, 32.5 and 31.3 for BU, BY and HZ. The correlation analysis reveals that oat ion accumulation is positively correlated with biomass. Besides, straw Na+and Cl−accumulation is respectively negatively (p< 0.05) correlated with K+. According to above that oat is a potential plant species in improvement of saline soil. However the low biomass and salinity tolerance limit its practical application in coastal saline-alkali soils North China.