Seasonal Variability in Soil Inorganic Nitrogen Across Borders Between Woodland and Farmland in the Songnen Plain of Northeast China

LIN Chang-Cun; FU Yao; LIU Li; WANG Kun; WANG De-Li

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Seasonal Variability in Soil Inorganic Nitrogen Across Borders Between Woodland and Farmland in the Songnen Plain of Northeast China

机译：东北松嫩平原林地与农田交界处土壤无机氮的季节变化

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To study the seasonal variability of soil inorganic nitrogen (N) across borders at the woodland-farmland ecotone and potential mechanisms,contents of soil inorganic N were measured during the dry season (May 20 and June 30) and the rainy season (August 10 and September 20) of 2006 in the Songnen Plain of Northeast China.The borders between farmland and woodland were determined by a border-and-ecotone detection analysis (BEDA).The ecotone limits,often referred to as the depth-of-edge influence (DEI),are critical for determining the scale at which edge effect operates.The results showed that the soil inorganic N border between the woodland and farmland was located further toward the woodland interior during the rainy season (DEI =53.4 ±-8.7 m,August 10) than during the dry season (DEI =35.0 ± 12.6 m,May 20).The seasonal variability in the soil inorganic N border was found to be associated with seasonal changes of deposition flux of N (the correlation coefficients between them for the dry season and rainy season were 0.61 and 0.67,respectively),which resulted from foliation patterns of trees and crops.Accordingly,the leaf area index at woodland edges was lower than that in the woodland interior,so woodland edges captured large amounts of atmosphere nitrogen deposition.The average DEI was 44.1 m,which was in accordance with the values of other temperate forest boundaries in literatures; therefore,BEDA was an appropriate method to estimate the borders of ecotones.

机译：为了研究林地-农田过渡带跨界土壤无机氮的季节变化及其潜在机理，在干旱季节（5月20日和6月30日）和雨季（8月10日和8月10日）测量了土壤无机氮的含量。（2006年9月20日）在中国东北的松嫩平原。农田和林地之间的边界是通过边界和生态共生检测分析（BEDA）确定的。生态共生极限通常称为边缘深度影响（结果表明，在雨季，林地和农田之间的土壤无机氮边界更靠近林地内部（DEI = 53.4±-8.7 m，8月10）比干旱季节（DEI = 35.0±12.6 m，5月20日）。土壤无机氮边界的季节变化与氮沉降通量的季节变化有关（干旱之间的相关系数）季节和雨季分别为0.61和0.67），这是由树木和农作物的叶型引起的。因此，林地边缘的叶面积指数低于林地内部的叶面积指数，因此林地边缘捕获了大量的大气氮沉积。平均DEI为44.1 m，与文献中其他温带森林边界的值一致;因此，BEDA是估算生态交错带边界的合适方法。

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《土壤圈（英文版）》 |2013年第4期|472-481|共10页
作者
LIN Chang-Cun; FU Yao; LIU Li; WANG Kun; WANG De-Li;
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作者单位

The Academy of Forestry, Beijing Forestry University, Beijing 100083 China;

Department of Grassland Science, China Agricultural University, Beijing 100193 China;

Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Northeast Normal University, and Key Laboratory of Ecological Restoration and Ecosystem Management of Jilin Province, Changchun 130024 China;

Chinese Research Academy of Environmental Sciences, Beijing 100012 China;

Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Northeast Normal University, and Key Laboratory of Ecological Restoration and Ecosystem Management of Jilin Province, Changchun 130024 China;

Department of Grassland Science, China Agricultural University, Beijing 100193 China;

Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Northeast Normal University, and Key Laboratory of Ecological Restoration and Ecosystem Management of Jilin Province, Changchun 130024 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
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Seasonal Variability in Soil Inorganic Nitrogen Across Borders Between Woodland and Farmland in the Songnen Plain of Northeast China

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