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土壤速效p
相关语句
  soil available p
    The content of soil available P and rapidly available K in subsoil in these two reforested patterns are lower than in farmland.
    两种退耕还林模式表层土壤速效P和速效K含量均低于农耕地。
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  “土壤速效p”译为未确定词的双语例句
    The Distribution of Soil Available Phosphorus and its Correlations with Plant Species Diversity in the Forest of Mt.Jinyun.
    缙云山森林土壤速效P的分布特征及其与物种多样性的关系研究
短句来源
    The change of SOM and rapidly available P in differ plot and differ layer were different.
    各样地不同土层的土壤有机质和土壤速效P含量变化趋势有所不同。
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  soil available p
Surface soil available P under tree canopies was 34-50% higher than the corresponding soil away from canopies.
      
Phosphorus-based manure or compost application resulted in similar grain yields to those for N-based treatments but had significantly less soil available P level after 4 yr of application.
      
Although differences were not statistically significant, soil available P concentration tended to increase at early stages of liming for both plantations.
      
However, at the same levels of soil available P and K, field-grown tithonia consistently produced lower leaf P and K concentrations than that grown in hedges.
      
We quantified inputs from the atmosphere, dissolved and particulate-bound losses, throughfall and litterfall fluxes, standing crop litter and soil available P pools.
      
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Effects of fertilizer application of P and PK on soil properties and foliar nutrients of young

1991~1995年期间,在江西景德镇市低丘千枚岩和第4纪红土红壤上,研究了火炬松、湿地松幼林施肥(P和PK)对土壤性质和叶片养分的影响。结果表明:(1)2个施肥处理使火炬松和湿地松林土壤速效P含量提高,有机质等其它土壤肥力指标下降。施P肥加速了有机质矿化和林木对N的吸收;(2)2个施肥处理能提高湿地松林土壤细菌、真菌和纤维分解菌的数量,减少放线菌的数目,而施肥前期对好气固N菌、P细菌有促进作用,后期对其有抑制作用;(3)2个施肥处理能明显提高湿地松林土壤脲酶和过氧化氢酶活性,施肥前期磷酸酶活性受到抑制,施肥后期磷酸酶活性不再受抑,酶活性大大提高。P肥能提高蔗糖酶活性,而PK肥对蔗糖酶活性有抑制作用;(4)湿地松林施肥2年后,叶片养分有明显变化,P和PK处理提高了叶片Ca、Mg的含量,降低了N水平,而对P和K含量影响不大。

Azadirachta indica is an excellent multiple purpose tree adaptive to the climate of hot and arid valley.It has played an important role in ecological environment construction and in regional economy development since introduced into China.This paper aimed at giving some evidences of the relationship between growth increment of Azadirachta indica plantation and site conditions basis on the investigating materials of the neem plantation in Yuanmou County.The results of simple regression showed that the height...

Azadirachta indica is an excellent multiple purpose tree adaptive to the climate of hot and arid valley.It has played an important role in ecological environment construction and in regional economy development since introduced into China.This paper aimed at giving some evidences of the relationship between growth increment of Azadirachta indica plantation and site conditions basis on the investigating materials of the neem plantation in Yuanmou County.The results of simple regression showed that the height increment of the top tree and mean tree of the plantation increased corresponding to the slope location (from mountaintop to the valley), soil moisture, soil capillary porosity, available soil depth, and rapid available P_2O_5 with linear function.The results of stepwise variable selection showed that the main factors effecting tree growth were slope location,soil capillary porosity and organic matter contents.The multiple equations were worked out based on data analysis.

对元谋干热河谷印楝人工林生长与土壤物理性质、化学性质和地形因子的关系进行了分析研究。单因子分析结果表明,印楝树高生长量指标与坡位、土壤含水量、土壤毛管孔隙度、有效土层厚度、土壤速效P含量之间呈显著或极显著正相关;逐步回归分析结果表明,坡位、土壤毛管孔隙度、土壤有机质含量及其组合是影响印楝生长的主导因子。缺磷少氮和水分含量低是印楝人工林土壤的共同特点,在选择造林地或制定营林措施时应当引起重视。

 
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