Bare Soil vs. Covered Soil in a Rainstorm

A two-minute silent educational picture film with Chinese and English captions. Real photographs are credited on screen; AI reconstructions are marked and are not microscopy or measurement evidence. Gentle digital camera movement does not represent recorded machine or biological motion. Field settings require local adaptation. Photographs come from different fields and dates, not a controlled comparison. Some images are reused across this series. Companion article: CA-001.

Scene 1: Jack Dykinga, USDA ARS | https://www.ars.usda.gov/oc/images/photos/k7520-8/ | Public domain per ARS Image Gallery policy; no endorsement
Scene 2: USDA NRCS | https://www.nrcs.usda.gov/conservation-basics/soil/soil-health/soil-health-on-cropland | U.S. federal agency photograph; retain USDA NRCS credit; no endorsement
Scene 3: GAKI · 既有AI教学重建 / AI reconstruction | {'name': 'Moist Soil Aggregates in Close Focus.png', 'library_file_id': 'libfile_35edc58c2ccc8191bb402674a55ba32e', 'file_id': 'file_00000000c88c81fd968b5ca697b1f5d1', 'created_at': '2026-09-25T02:39:54.630936Z', 'kind': 'Previously generated AI teaching reconstruction'} | Previously generated AI teaching reconstruction
Scene 4: GAKI · 既有AI教学重建 / AI reconstruction | {'name': 'Fine Root Following an Old Soil Channel.png', 'library_file_id': 'libfile_d5fb377eb57481919be20df8ecccea5e', 'file_id': 'file_000000004d2481fd84877a46dab75b88', 'created_at': '2026-09-25T02:39:57.965657Z', 'kind': 'Previously generated AI teaching reconstruction'} | Previously generated AI teaching reconstruction
Scene 5: Jack Dykinga, USDA ARS | https://www.ars.usda.gov/oc/images/photos/apr97/k5951-1/ | Public domain per ARS Image Gallery policy; no endorsement
Scene 6: GAKI · 既有AI教学重建 / AI reconstruction | {'name': 'Tyre rut in moist maize stubble.png', 'library_file_id': 'libfile_ac722e3981e48191aefa0fff2bedd6ac', 'file_id': 'file_00000000ecec81fd8c2c267d38e8f226', 'created_at': '2026-09-25T02:40:02.818750Z', 'kind': 'Previously generated AI teaching reconstruction'} | Previously generated AI teaching reconstruction
Scene 7: USDA NRCS / Brandon O’Connor | https://www.nrcs.usda.gov/state-offices/indiana/soil-health-indiana | U.S. federal agency photograph; retain USDA NRCS credit; no endorsement
Scene 8: GAKI · 既有AI教学重建 / AI reconstruction | {'name': 'Moist Soil Beneath Straw.png', 'library_file_id': 'libfile_3567b1a980bc81918fc893cdf6f37279', 'file_id': 'file_00000000eb0481fd9de220b794333627', 'created_at': '2026-09-25T02:39:53.113395Z', 'kind': 'Previously generated AI teaching reconstruction'} | Previously generated AI teaching reconstruction