摘要
通过室内培养试验,研究了赤子爱胜蚓(Eisenia foetida)和威廉环毛蚓(Metaphire guillelmi)对土壤氨基酸组分及含量的影响,并探讨了两种不同生活型蚯蚓作用效果的异同。结果表明:蚯蚓活动可显著改变土壤氨基酸含量,爱胜蚓作用下土壤酸解氨基酸和游离氨基酸分别增加5.08 g/kg和7.72 mg/kg,环毛蚓作用下土壤酸解氨基酸和游离氨基酸分别增加3.86 g/kg和4.44mg/kg。各处理酸解氨基酸均以中性氨基酸所占比例为最大(平均51.9%),酸性氨基酸次之(平均23.3%),而含硫氨基酸(平均14.4%)及碱性氨基酸最少(平均10.4%)。各处理游离氨基酸同样以中性氨基酸为主,平均54.4%,而以碱性氨基酸含量最少,平均仅为7.2%。蚯蚓活动并未改变土壤氨基酸可检出种类,各处理分别检测出16种酸解氨基酸和14种游离氨基酸。土壤酸解氨基酸和游离氨基酸组分含量在蚯蚓作用下均有明显改变:加入爱胜蚓后土壤酸解氨基酸组分中天冬氨酸、精氨酸、甲硫氨酸、丙氨酸、赖氨酸和甘氨酸增幅较高,均在85.7%以上,缬氨酸、苏氨酸、丝氨酸、谷氨酸、亮氨酸、酪氨酸和组氨酸增幅较小在40.7%—62.7%间波动;加入环毛蚓后土壤酸解氨基酸组分中甲硫氨酸、赖氨酸、天冬氨酸、酪氨酸和丙氨酸增幅较大,均在71.9%以上,甘氨酸、精氨酸、异亮氨酸增幅适中,分别为56.8%、55.6%和54.9%;丝氨酸、亮氨酸、苏氨酸、谷氨酸、组氨酸和苯丙氨酸增幅最小,均在40%以下;游离氨基酸组分中组氨酸、精氨酸、甘氨酸、亮氨酸、异亮氨酸和丙氨酸在加入爱胜蚓后增加的幅度较大,增幅在150.0%以上,增幅较为缓和的氨基酸组分有天冬氨酸、苏氨酸、丝氨酸、缬氨酸、谷氨酸和苯丙氨酸,介于58.8%—92.1%之间;环毛蚓作用下,天冬氨酸、精氨酸、丝氨酸和异亮氨酸增幅最大,分别为184.2%、173.3%、163.0%和116.6%;苏氨酸、亮氨酸、缬氨酸和甘氨酸增幅较缓,介于52.3%—92.7%之间;谷氨酸、组氨酸、苯丙氨酸、丙氨酸和甲硫氨酸增幅较低,均在33.1%之下;而半胱氨酸在蚯蚓作用下显著降低,降幅为11.8%。对比两种生活型蚯蚓作用效果可知,土壤氨基酸总含量及各组分含量在爱胜蚓和环毛蚓作用下的增加或减少趋势相同(土壤酸解氨基酸组分缬氨酸除外),但改变幅度却存在明显差异,总体而言,爱胜蚓作用效果优于环毛蚓。
The research was investigated to explore the effects of two types of earthworm （Eisenia foetida guillelmii） on content and constituent of soil amino acids in lab. The main results were as follows ： 1 ） The amino acids was modified by addition of earthworm, as the amount of acidic hydrolysable amino acid in soil 5.08 g/kg and 3.86 g/kg by activities of Eisenia foetida and Metaphire guillelmii respectively, and content and Metaphire content of soil was increased of free amino acid was enhanced 7.72 mg/kg and 4.44 mg/kg in addition of Eiseniafoetida and Metaphire guillelmii respectively. 2） The proportion of neutral amino acid to acid hydrolysable amino was the largest （average 51.9%） , the acidic amino acid took the second place （average 23.3%）, while the sulfur-containing and basic amino acid made up only 14.4% and 10.4% respectively. So was the free amino acid, as neutral amino acid played the primary part of 54.4%, and basic amino acid accounted just for 7.2%. 3） Earthworm activities did not alter the species of amino acid, of which 16 sorts of acid hydrolysable amino acid and 14 kinds of free amino acid were detected. 4） The constituent content of acid hydrolysable amino acid in soil was affected significantly by the activities of earthworm： with addition of Eisenia foetida, the aspartie acid, arginine, methionine, alanine and lysine were increased above 85.7%, while the valine, threonine, serine, glutamic acid, leucine, tyrosine and histidine had 40.7%-62.7% increasing. In the treatment of Metaphire guillelmii, methionine, lysine, aspartic acid, tyrosine and alanine were enhanced significantly at least 71.9%; glyeine, arginine and isoleucine had been increased 56.8% ,55.6% and 54.9% respectively ; the smallest increasing below 40% appeared in serine, leueine, threonine, glutamic acid, histidine and phenylalanine. 5 ） Addition of earthworm changed the constituent content of free amino acid obviously in the same time： under Eisenia foetida activities, the histidine, arginine, glyeine, leueine, isoleucine and alanine had the greatest growth （more than 150%） , but aspartic acid, threonine, serine, valine, glutamic acid and phenylalanine were increased gently of 58.8%-92.1%. Because of addition of Metaphire guillelmii, a significant increasing of 184.2%, 173.3%, 163.0% and 116.6% appeared in aspartic acid, arginine, serine and isoleucine respectively; The growth of threonine, leucine, valine and glycine were from 52.3% to 92.7%; The increasing of glutamic acid, histidine, phenylalanine, alanine and methionine were below 33.1%, while cysteine decreased significantly with 11.8%. Obviously, two biotypes of earthworm showed the same trend in total and constituent content of soil amino acid, but there are significant differences in intensity. Overall, Eisenia foetida did better than Metaphire guillelmi.
出处
《生态学报》
CAS
CSCD
北大核心
2015年第14期4816-4823,共8页
Acta Ecologica Sinica
基金
国家自然科学基金(41171206)
关键词
蚯蚓
土壤
酸解氨基酸
游离氨基酸
earthworm
soil
acidic hydrolyzable amino acid
free amino acid
