【摘要】：通過(guò)對(duì)我國(guó)土壤氮磷含量及化學(xué)計(jì)量比值的分布特征研究,探討了濕度梯度與植物生活型對(duì)土壤氮磷空間分布的影響。研究結(jié)果表明:中國(guó)陸地系統(tǒng)自然土壤氮、磷含量及氮磷比分別在0.02~8.78 g/kg,0.05~1.73 g/kg和0.06~9.85范圍內(nèi)變化,地形和氣候因素對(duì)其空間變異性的影響均較為顯著。干濕度梯度分帶對(duì)土壤氮含量和氮磷比值的影響較磷含量更為明顯,氮含量與氮磷比呈現(xiàn)出明顯的梯度變化特征,表現(xiàn)出濕潤(rùn)區(qū)半濕潤(rùn)區(qū)干旱區(qū)半干旱區(qū)的規(guī)律,而磷含量變化不顯著。在不同生活型植被土壤中,森林土壤氮磷的變化規(guī)律較灌木和草本土壤更為復(fù)雜;其植物磷平均含量低于全國(guó)平均值,說(shuō)明森林生態(tài)系統(tǒng)植物受磷元素的限制作用與其較低的土壤磷含量供給有關(guān)。土壤氮磷含量和氮磷比與年均降水量和年均溫度的相關(guān)性及逐步回歸分析表明,土壤氮磷及其化學(xué)計(jì)量的變異性主要是受降水的影響。
[Abstract]:The effects of soil moisture gradient and plant life patterns on the spatial distribution of soil nitrogen and phosphorus were studied by studying the distribution characteristics of soil nitrogen and phosphorus contents and stoichiometric ratios in China. The results showed that the nitrogen, phosphorus content and the ratio of nitrogen to phosphorus in the natural soil of the terrestrial system of China varied within the range of 0.02g / kg / kg 0.05 g/kg and 0.06g / kg / kg respectively 1.73 g/kg and 0.066% 9.85, respectively. The effects of topography and climate on spatial variability are significant. The effect of dry and wet degree gradient zoning on soil nitrogen content and ratio of nitrogen and phosphorus is more obvious than that of phosphorus content. However, there was no significant change in phosphorus content. The variation of nitrogen and phosphorus in forest soil is more complex than that in shrub and herbaceous soil. The average phosphorus content of the plant was lower than the national average, which indicated that the restriction of plant phosphorus in forest ecosystem was related to the low phosphorus content in the soil. The correlation and stepwise regression analysis between soil nitrogen and phosphorus content and ratio of nitrogen and phosphorus to average annual precipitation and annual temperature showed that the variability of soil nitrogen and phosphorus and its stoichiometry was mainly influenced by precipitation.
【作者單位】： 云南師范大學(xué)高原湖泊生態(tài)與全球變化實(shí)驗(yàn)室;云南師范大學(xué)旅游與地理科學(xué)學(xué)院;云南師范大學(xué)云南省高原地理過(guò)程與環(huán)境變化重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41461015) 云南省中青年學(xué)術(shù)技術(shù)帶頭人后備人才項(xiàng)目(2015HB029) 云南省水利廳項(xiàng)目(2014003)資助
【分類號(hào)】：S153
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本文編號(hào)：2355275