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被半穿刺线虫（Ｔｙｌｅｎｃｈｕｌｕｓｓｅｍｉｐｅｎｅｔｒａｎｓ）侵害后的杉木林地土壤酶活性及土壤化学性质的变化趋势经测试表明：土壤酶活性包括蛋白酶、脲酶、转化酶、酸性磷酸酶和中性磷酸酶明显降低．土壤基本养分含量包括全氮、全磷、水解氮、速效磷和速效钾明显下降．预示被线虫危害后杉木林地土壤生化活性强度呈减弱趋势，土壤肥力状况有趋与恶化的可能．γ０．０１＝０．７０６２．１．２脲酶脲酶能促进尿素水解，产生的氨是高等植物的直接氮源．表１表明，脲酶与土壤全磷呈极显著相关，与土壤有机质、全氮、水解氮、速效磷、速效钾呈显著相关．因此脲酶可作为土壤肥力的指标之一．２．１．３转化酶转化酶能催化蔗糖分解成葡萄糖和果糖，是参与土壤的碳素循环的重要酶类．从表１可知，转化酶与土壤有机质、全氮、水解性氮、速效磷、速效钾呈极显著相关，与全磷呈显著相关．表明转化酶不仅能促进土壤碳水化合物的转化，而且与土壤的氮、磷、钾的状况相关．２．１．４磷酸酶磷酸酶能促进土壤有机磷化合物的水解，使其有效化．由于土壤中大部分磷是以有机态存在，而且在酸性土壤中有机磷的含量特别高［７］．因此，磷酸酶对森林土壤来说具有特别重要的意义．磷酸酶活性能够反映土壤有机磷转?
The trend of soil enzyme activities and soil chemical properties of Cunninghamia lanceolata forest after invaded by Tylenchulus semipenetrans showed that the soil enzyme activities including protease, urease, invertase, acid phosphatase and neutral phosphatase were significantly decreased. The content of soil basic nutrients, including total nitrogen, total phosphorus, hydrolyzed nitrogen, available phosphorus and available potassium decreased significantly. It indicates that the intensity of soil biochemical activity in Cunninghamia lanceolata forest is weakened after nematode endangering, and soil fertility tends to worsen. γ0.01 = 0.7062.1.2 Urease Urease can promote urea hydrolysis, the ammonia produced is the direct nitrogen source of higher plants. Table 1 shows that urease was significantly correlated with total phosphorus in soil and significantly correlated with soil organic matter, total nitrogen, hydrolyzed nitrogen, available phosphorus, and available potassium. Therefore, urease can be used as an indicator of soil fertility. 2.1.3 Invertase Invertase catalyzes the breakdown of sucrose into glucose and fructose, which are important enzymes involved in soil carbon cycle. As can be seen from Table 1, invertase was significantly correlated with soil organic matter, total nitrogen, hydrolyzable nitrogen, available phosphorus and available potassium, and significantly correlated with total phosphorus. The results showed that invertase not only promoted the transformation of soil carbohydrates, but also related to the status of nitrogen, phosphorus and potassium in soils. 2.1.4 Phosphatase Phosphatase can promote the hydrolysis of soil organic phosphorus compounds, to make it effective. Since most of the phosphorus in the soil exists in the organic state, the content of organic phosphorus in the acid soil is extremely high [7]. Therefore, phosphatase is of particular importance to forest soils. Phosphatase activity can reflect soil organic phosphorus turn?