| 石灰性土壤施磷、铁对柠条生长及根际土壤环境的影响 |
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| 引用本文： | 陈明昌,马红梅,张强,程滨,杨治平,刘平,李磊. 石灰性土壤施磷、铁对柠条生长及根际土壤环境的影响[J]. 土壤学报, 2005, 42(5): 783-791 |
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| 作者姓名： | 陈明昌 马红梅 张强 程滨 杨治平 刘平 李磊 |
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| 作者单位： | 山西省土壤环境和养分资源重点实验室,山西省农业科学院土壤肥料研究所,太原,030031 |
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| 基金项目： | 农业部“948”项目（2004-Z32）“北方干旱半干旱盐碱区生态建设关键技术的引进”的部分研究内容 |
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| 摘 要： | 采用随机区组和裂区设计,通过盆栽和根箱模拟试验研究了石灰性土壤,在水分充足的条件下施磷及磷、铁对柠条生长发育及根际土壤养分有效性的影响。盆栽试验结果表明,柠条的生物产量随着施磷水平的增加而增加;在低磷或磷胁迫条件下,柠条的地上部生长受到抑制,根冠比增大,土壤pH值迅速降低。根箱模拟试验发现,不同的铁、磷施肥配比对柠条生物产量的影响不同,当磷和铁的施用量分别为P2O50.15 g kg-1 和FeSO4·7H2O0.03g kg-1时能明显提高柠条的生物量。不同铁、磷配比对柠条根际土壤有效磷含量影响的根际范围是0-6 mm之间,在此范围内供试土壤有效磷含量随距离快速下降,并与根际土壤pH值呈反比。柠条对根际土壤pH的调控主要受磷水平的影响,而施铁水平对根际和根外土壤pH值的影响比较小。
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| 关 键 词： | 柠条 有效磷 速效铁 pH 根际土壤环境 |
| 收稿时间： | 2004-07-26 |
| 修稿时间： | 2004-07-262005-04-12 |
EFFECTS OF P AND Fe APPLICATION ON GROWTH OF Caragana AND RHIZOSPHERIC ENVIRONMENT IN CALCAREOUS SOILS |
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| Chen Mingchang,Ma Hongmei,Zhang Qiang,Cheng Bin,Yang Zhiping,Liu Ping and Li Lei. EFFECTS OF P AND Fe APPLICATION ON GROWTH OF Caragana AND RHIZOSPHERIC ENVIRONMENT IN CALCAREOUS SOILS[J]. Acta Pedologica Sinica, 2005, 42(5): 783-791 |
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| Authors: | Chen Mingchang Ma Hongmei Zhang Qiang Cheng Bin Yang Zhiping Liu Ping Li Lei |
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| Affiliation: | The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;The Key Laboratory of Soil Environment and Nutrient Resources of Shanxi, Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China |
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| Abstract: | Pot and root-box experiment of randomized block and split block design were conducted for determinating effects of P application and combined application of P and Fe2+ on growth of Caragana and its rhizospheric environment in calcareous soils with sufficient water supply.Results of the pot experiment show that caragaaa biomass increased with P application rate.Under the stress of low P or P deficiency,shoot growth of Caragana was restricted,the ratio of root/shoot increased and soil pH decreased rapidly.The root-box experiment demonstrates that effect of combined application of P and Fe2+ on Caragana biomass varied with the ratio.When the P and Fee+application rate was P205 0.15 g kg-1 and FeSO4·7 H20 0.03 g kg-1,respectively,an evident increase in Caragana biomass was observed over other treatments.The effect of combined application of P and Fe2+ on available P in the rhizosphere (0-6 mm) decreased rapidly with increasing distance,and was just in reverse on soil pH.Resups show that soil pH in the rhizosphere was mainly controlled by P application rate,and the application rate of Fe did not have much effect on soil pH in the rhizosphere or the root zone. |
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| Keywords: | Caragana Available phosphorus Available iron pH Rhizospheric environment |
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