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越冬期苹果根系氨基酸总量和蛋白酶活性在12～l月保持低水平，2月份开始回 升，3～4月增幅最大；冬季地膜覆盖提高了根系蛋白酶活性和氨基酸含量，初冬和初春效果 最明显。氨基酸总量，细根高于粗根；蛋白酶活性，初春粗根高于细根；蛋白质含量于1月份 出现高峰，3月以前粗根高于细根；覆膜对蛋白质含量影响不明显。冬春根中含多种氨基酸， 但以天门冬氨酸、谷氨酸、脯氨酸和精氨酸为主；越冬之后粗根中有3种氨基酸（ASp On、A吧）含量增加，细根中有匕种氨基酸（灿卜On、＊h、％r、G匕川a、＊1、Ik、 LSu。Tyr、Phy、LyS、His）合量增加；两种根内脯氨酸含量均是冬季大于春季。
The total amount of amino acids and protease activity in the roots of apple during the winter were low, and began to rise in February and March, respectively. The increase in winter and spring was the most significant in winter and early spring. The total amount of amino acids and fine roots were higher than that of coarse roots. The protease activity was higher in early spring than that in fine roots. The protein content peaked in January and was higher than that in fine roots before March. The effect of plastic film on protein content was insignificant. Winter and spring roots contain a variety of amino acids, but mainly aspartic acid, glutamic acid, proline and arginine; after winter, there are three kinds of amino acids (ASpOnA, A) increased, fine In the roots, there was an increase in the combined amount of dagger amino acids (A *, A *, Ik, LSu.Tyr, Phy, LyS, His) It is bigger than spring in winter.