| 沙地疏林草地和樟子松人工林土壤中不同形态磷素含量和磷酸单酯酶活性的比较 |
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| 引用本文： | 赵琼,曾德慧.沙地疏林草地和樟子松人工林土壤中不同形态磷素含量和磷酸单酯酶活性的比较[J].林业研究,2006,17(1):25-30. |
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| 作者姓名： | 赵琼 曾德慧 |
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| 作者单位： | [1]Daqinggou Ecological Station, Institute of Applied Ecology Chinese Academy of Sciences, Shenyang 110016, P R. China [2]Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China |
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| 基金项目： | 中国科学院资助项目，the National Natural Science Foundation of China，project of the Institute of Applied Ecology of Chinese Academy of Sciences |
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| 摘 要： | 为评价我国北方大规模人工造林对土壤磷素转化及磷素有效性的影响,对半干旱沙地樟子松人工林和天然植被(疏林草地)不同层次(0～5 cm, 5～20 cm)土壤中不同形态磷组分和磷酸单酯酶活性进行了比较.结果表明:除人工林土壤中活性有机磷不受土壤深度影响外,各样地表层土壤中各种磷素含量和酶活性均显著高于低层土壤,但分层效应在人工林中低于疏林草地;与疏林草地土壤相比,除Al-P外,人工林土壤中各种磷素绝对含量和酶活性均显著降低,总有机磷和Ca-P在全磷中的比例显著下降,而活性磷,Al-P和Fe-P占全磷的比例增加.可见表层土壤是磷素转化最活跃的区域,凋落物分解是土壤磷的主要来源;用樟子松进行人工造林促进了有机磷的矿化和Ca-P的溶解,提高了土壤磷素的有效性,同时导致土壤总磷库逐渐耗竭.要维持该人工防护林功能和稳定性,必须对地被物予以保护,并进行适当施肥.表3参38.
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| 关 键 词： | 造林 土壤不同形态磷素 磷素有效性 磷酸单酯酶 风沙土 |
| 文章编号： | 1007-662X（2006）01-0025-06 |
| 收稿时间： | 2005-05-18 |
| 修稿时间： | 2005-08-29 |
Phosphorus fractions and phosphomonoesterase activities in sandy soils under a temperate savanna and a neighboring Mongolian pine plantation |
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| Qiong Zhao,De-hui Zeng.Phosphorus fractions and phosphomonoesterase activities in sandy soils under a temperate savanna and a neighboring Mongolian pine plantation[J].Journal of Forestry Research,2006,17(1):25-30. |
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| Authors: | Qiong Zhao De-hui Zeng |
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| Institution: | (1) Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, P. R. China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, P. R. China |
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| Abstract: | To assess the effects of savanna afforestation on soil phosphorus (P) transformations in eastern Horqin Sandy Land, China,
P fractions and phosphomonoesterase activities were examined in two soil horizons (0–5 cm and 5–20 cm) under a savanna and
an adjacent 30-year-old Mongolian pine (Pinus sylvestris L. var. mongolica Litv.) plantation on a P-deficient semi-arid sandy soil. The results showed that all soil P fractions and phosphomonoesterase
activities decreased with soil depth at both sites except that labile organic P under the plantation was constant with soil
depth. In contrast to savanna, soils under Mongolian pine plantation had lower phosphomonoesterase activities and concentrations
of all P fractions (with an exception of Al-P), lower proportions of organic P and Ca-P in total P, and higher proportions
of labile P, Al-P and Fe-P in total P. These results suggested that P transformations mainly occurred in surface soils, and
P recycled through litter-fall was the most important source of plant available P. Mongolian pine afforestation enhanced the
bioavailability of both organic P and Ca-P, simultaneously reduced soil P pools, indicating that protection of forest floor
and P fertilization are necessary to maintain the sustainable functioning of Mongolian pine plantations.
Biography: ZHAO Qiong (1982–), female, Ph. D. in Daqinggou Ecological Station, the Institute of Applied Ecology, Chinese Academy of
Sciences, Shenyang 110016, P. R. China. |
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| Keywords: | Afforestation P fractions P bioavailability Phosphomonoesterase activity Sandy soil |
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